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Relatives of victims remember their loved ones who died in the Nevada air race crash.

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NTSB cites sleep loss, poor oversight in 2011 bus crashupdated: Wed Aug 01 2012 07:04:00

The National Transportation Safety Board has concluded a deadly accident involving a bus driver who fell asleep while driving on a Virginia interstate last year was caused in part by "acute sleep loss" as well as inadequate oversight by the bus company and the government.

Feds: Operator knew of pipeline problems years before Michigan oil spill updated: Wed Jul 11 2012 09:54:00

The operator of an oil pipeline that cracked in 2010 and gushed nearly a million gallons of oil into a Michigan creek and river failed to make repairs and take appropriate action after recognizing structural problems several years earlier, the National Transportation Safety Board said on Tuesday.

NTSB: Airplane radar not always accurateupdated: Fri Jun 22 2012 20:44:00

CNN's Lizzie O'Leary reveals a major flaw in a new state of the art weather radar display for private airplanes.

NTSB: Cockpit weather displays could mislead private pilotsupdated: Fri Jun 22 2012 20:44:00

Weather imagery that private pilots see on cockpit displays -- advertised as "real time" data by some firms -- could be up to 20 minutes old, giving pilots a dangerously false sense of existing conditions, federal safety officials warned this week.

NTSB: Deadly 2011 bus crash caused by fatigue, speed, poor oversight updated: Tue Jun 05 2012 17:16:00

A bus crash that killed 15 people and injured 18 others was caused by a "perfect storm" of sleep deprivation, speed and lack of oversight, the National Transportation Safety Board said Tuesday.

U.S. asks Canada to invistigate air collision with FAA, NTSB tiesupdated: Tue May 29 2012 18:42:00

The midair collision of two small planes about 50 miles from Washington is under investigation by Canadian officials because one plane was owned by an FAA employee and the other by an NTSB employee, federal officials said Tuesday.

NTSB issues preliminary report on mysterious Gulf of Mexico plane crashupdated: Fri Apr 27 2012 15:20:00

Pilot Peter Hertzak, a cosmetic surgeon, took off on a solo flight from Slidell Municipal Airport in Slidell, Louisiana, last Friday in his twin-engine Cessna 421C en route to Sarasota, Florida. Some three hours later, his plane descended in a fatal death spiral into the Gulf of Mexico. What happened in between still has federal investigators looking for clues.

NTSB: Ferry crash caused by malfunction updated: Tue Apr 24 2012 21:09:00

A ferry accident two years ago in Staten Island, New York, was caused by a technical malfunction, according to a federal investigation. Fifty people were injured, three seriously.

NTSB: Pilot overwhelmed by g-forces in Reno crash updated: Tue Apr 10 2012 18:37:00

The pilot of the P-51 Mustang that crashed at the Reno Air Races last September experienced overwhelming g-forces at the outset of the incident, and likely was incapacitated almost instantly, the National Transportation Safety Board said Tuesday.

NTSB report on near collision in Mississippi cites controller, towerupdated: Thu Jan 19 2012 12:10:00

An air traffic controller unintentionally placed a passenger jet and a single-engine plane on a collision course at a Mississippi airport last summer, causing the planes to pass within 300 feet of each other in midair, according to the National Transportation Safety Board.

NTSB: Planes at Chicago's Midway came within 300 feet of each otherupdated: Wed Jan 11 2012 19:12:00

A Learjet departing Chicago's Midway airport last month came within about two plane-lengths of striking a taxiing Southwest Airlines Boeing 737 that had been cleared to cross the same runway, according to a preliminary report by the National Transportation Safety Board.

CNNMoney: Cell phone bans don't work - insurance groupupdated: Thu Dec 15 2011 16:13:00

Cell phone bans, such as those recently recommended by the National Transportation Safety Board, have so far proven useless when it comes to actually reducing car crashes, according to the Insurance Institute for Highway Safety.

Call for car-phone ban likely to meet busy signal in statesupdated: Thu Dec 15 2011 08:19:00

The National Transportation Safety Board's big, bold stroke encouraging all states to prohibit drivers from using cell phones faces a long, tortuous process in the nation's statehouses, experts said Wednesday.

NTSB rep on calling for cell phone banupdated: Thu Dec 15 2011 08:19:00

Debbie Hersman, chair of the NTSB, on why the group recently recommends banning all electronic devices in a car.

Are we too hooked on our phones for a driving ban?updated: Thu Dec 15 2011 06:09:00

A federal agency in charge of safety on the roads wants an outright ban on using mobile phones while driving. But what if we're just too hooked on our smartphones and other digital gadgets to care?

NTSB compares phone use to driving drunkupdated: Thu Dec 15 2011 06:09:00

An NTSB spokeswoman compares cell phone use in the car to drinking and driving.

NTSB wants cell phone ban while drivingupdated: Wed Dec 14 2011 13:09:00

Debbie Hersman explains NTSB support of a ban on cell phone use while driving and how the ban could be enforced.

NTSB recommends full ban on use of cell phones while drivingupdated: Wed Dec 14 2011 13:09:00

A federal safety board called Tuesday for a nationwide ban on the use of cell phones and text messaging devices while driving.

First lawsuit filed in Reno air race crash updated: Tue Nov 01 2011 21:24:00

The family of a spectator killed in an air race crash in September has filed suit, claiming the Reno, Nevada, crash was not a "freak accident," but was "the predictable result of a reckless drive for speed by a risk-taking pilot and crew, coupled with an insatiable drive for profit" by race organizers.

11th person dies as result of Nevada air race crashupdated: Tue Sep 20 2011 22:09:00

An 11th person has died because of injuries sustained in the crash Friday at an air race at Reno, Nevada, an official with the Washoe County Medical Examiner's Office said Tuesday.

7 victims killed in crash at Nevada air race identifiedupdated: Tue Sep 20 2011 02:27:00

Authorities have identified seven of the 10 people who died following a crash at an air show in Reno, Nevada, on Friday.

Federal board urges cell phone ban for commercial truckersupdated: Mon Sep 19 2011 12:58:00

In an action that could affect millions of truckers, the National Transportation Safety Board on Tuesday recommended that commercial drivers be prohibited from using both hand-held and hands-free mobile phones while driving on the job.

NTSB slams PG&E over 2010 pipeline blastupdated: Tue Aug 30 2011 20:12:00

The NTSB sharply criticized pipline owner PG&E for the San Bruno, California pipeline explosion from 2010.

NTSB hits pipeline owner, regulators in deadly California blastupdated: Tue Aug 30 2011 20:12:00

A faulty pipe, flawed operations, and inadequate government oversight led to the 2010 Northern California natural gas explosion that killed eight people, federal officials said Tuesday.

NTSB to assist South Korea in cargo plane crash probeupdated: Sun Jul 31 2011 23:14:00

The National Transportation Safety Board will assist the South Korean government in investigating the crash of an Asiana Airlines cargo plane, officials said Friday.

What caused the Air France crash?updated: Fri Jul 29 2011 06:18:00

Sources say the Air France pilots were distracted just before the crash. CNN's RIchard Quest reports.

Federal board to look at safety of home-built planesupdated: Thu Jul 14 2011 19:52:00

Federal safety investigators Thursday launched a study of home-built aircraft to see if there are ways to drive down accident rates.

NTSB faults Coast Guard for fatal boat crashupdated: Tue Jul 12 2011 17:59:00

The U.S. Coast Guard, champion of boating safety everywhere, is to blame for a tragic 2009 accident that killed an 8-year-old boy during a holiday boat parade in San Diego Bay, a federal safety board said Tuesday.

NTSB chairwoman cites 'deadliness of distraction' in duck boat crashupdated: Tue Jun 21 2011 17:39:00

The sinking of a duck boat that killed two people was "another tragic example of the deadliness of distraction" the chairwoman of the National Transportation Safety Board said Tuesday after a final report showed several people involved were on the cell phones or computers.

Investigators fail to find firm cause in crash that killed Ted Stevensupdated: Tue May 24 2011 16:52:00

Federal accident investigators admitted Tuesday they don't really know what caused the deadly crash in Alaska last year of a plane carrying former U.S. Sen. Ted Stevens. The longtime Republican was among five people killed, including the pilot, who was taking a group to a fishing camp in the rugged Alaskan terrain.

NTSB: Southwest Airlines probe looks at paint and rivet holesupdated: Tue Apr 26 2011 06:51:00

Investigators have zeroed in on several clues as to why the fuselage of a Southwest Airlines B-737 ruptured on April 1.

More Southwest planes inspectedupdated: Tue Apr 26 2011 06:51:00

CNN's Jeanne Meserve reports on the widening investigation of the Southwest Airlines plane incident.

NTSB urges fatigue-fighting strategies for air traffic controllersupdated: Mon Apr 25 2011 17:25:00

The National Transportation Safety Board hopes air traffic controllers may soon benefit from long-standing research into worker fatigue by implementing strategies that include intentional sleeping on the job, the use of caffeine and other methods shown by science to deal with the overnight shift.

Asleep at the controls? What's going on with air traffic controllersupdated: Mon Apr 25 2011 10:49:00

The headlines are glaring, even frightening: Air traffic controllers asleep on the job.

NTSB: Jet pulled 'alongside' small aircraft in March incidentupdated: Fri Apr 22 2011 23:16:00

Acting at the request of an air traffic controller, the pilot of a Southwest Airlines B-737 pulled within one-tenth of a mile of a small, four-seat aircraft last month to check on pilot of the smaller plane, who had not responded to radio calls, the National Transportation Safety Board said Friday.

'Widespread cracking' found where hole opened on Southwest jetupdated: Mon Apr 04 2011 00:30:00

Investigators found "widespread cracking" on the skin of a Southwest Airlines Boeing 737 that made an emergency landing in Arizona after a hole opened on top of the aircraft during flight Friday, a National Transportation Safety Board member said Sunday.

New details revealed in fatal Bronx bus crashupdated: Thu Mar 31 2011 16:16:00

A National Transportation Safety Board investigation has revealed new facts about the Bronx crash that killed 15 people in early March, with the head of the NTSB issuing renewed calls for changes in bus safety and regulation of bus companies.

NTSB: Air traffic controller fell asleep, leaving planes on their ownupdated: Fri Mar 25 2011 05:55:00

The air traffic controller suspended for failing to respond to two planes heading into Ronald Reagan Washington National Airport has told investigators that he had fallen asleep, according to the National Transportation Safety Board.

NTSB investigates a near mid-air collision over New Yorkupdated: Sat Feb 05 2011 12:48:00

A near mid-air collision last month between a commercial airliner and two military planes just outside New York City is under investigation, the National Transportation Safety Board said Friday.

NTSB releases first report on deadly California pipeline explosionupdated: Fri Jan 21 2011 19:33:00

The National Transportation Safety Board on Friday released the first report on the natural gas pipeline explosion that killed eight people in San Bruno, California, last year.

FAA to investigate coffee spill that diverted flightupdated: Thu Jan 06 2011 05:52:00

Federal aviation authorities say they are investigating a string of events that began Monday when a pilot spilled coffee on a cockpit panel, leading to a false hijack warning and culminating in the plane's emergency landing in Canada.

Should beverages be banned from cockpit?updated: Thu Jan 06 2011 05:52:00

A coffee spill in the cockpit of a United flight had larger ramifications Monday, and now officials are investigating.

NTSB issues urgent safety calls in aftermath of pipeline explosionupdated: Mon Jan 03 2011 17:55:00

The National Transportation Safety Board on Monday issued seven recommendations, calling six of them urgent, as the result of its investigation into the fiery natural gas pipeline explosion that killed eight people and destroyed 37 homes in San Bruno, California, four months ago.

NTSB: Bird strike caused fatal 2009 helicopter crashupdated: Wed Nov 24 2010 14:12:00

A 2009 helicopter crash in which eight people died was due to a bird striking the chopper's windshield, the National Transportation Safety Board said Wednesday.

Motorcycle helmets on NTSB's 'Most Wanted' listupdated: Tue Nov 16 2010 17:17:00

The National Transportation Safety Board Tuesday called on states to require all motorcycle riders wear helmets.

NTSB: Passenger jet and cargo plane came within 100 feetupdated: Thu Sep 23 2010 12:55:00

A US Airways jetliner last week came within 100 feet of colliding with a small cargo plane near the Minneapolis-St. Paul Airport, according to the National Transportation Safety Board, which announced Thursday it is investigating the incident.

Alcohol no factor in boat accidentupdated: Sat Sep 18 2010 20:33:00

The NTSB says alcohol tests came back negative for all crew on both vessels involved in a tour boat accident.

Duck boats' safety record, agency's fears don't jibeupdated: Sat Sep 18 2010 20:33:00

A wrongful death lawsuit filed in the aftermath of a July boat accident questions the safety of amphibious tour vessels, but the so-called duck boats' record indicates just two fatal accidents in more than 50 years of service.

Technique, air controller's phone call cited in fatal plane crashupdated: Wed Sep 15 2010 10:13:00

A personal phone conversation by an air traffic controller likely contributed to the cause of a deadly midair collision over the Hudson River last year, the The National Transportation Safety Board said.

Last 5 seconds before fatal crashupdated: Wed Sep 15 2010 10:13:00

A small plane that hit a sightseeing helicopter last summer had little time to avoid the accident, NTSB documents show.

Senator demands answers in California blazeupdated: Sat Sep 11 2010 22:21:00

California Sen. Barbara Boxer demanded answers Saturday to questions about why a gas transmission line ruptured in a suburban San Francisco town, triggering a massive fire that killed four people and left five people missing.

NTSB: No distress calls in Alaska crashupdated: Thu Aug 12 2010 06:09:00

The NTSB says they have no record of any distress calls coming from the plane that crashed in Alaska.

NTSB probes school bus accidentupdated: Fri Aug 06 2010 12:06:00

An NTSB spokesman explains the probe of a multi-vehicle that killed two people.

NTSB criticizes Washington Metro over 2009 crashupdated: Tue Jul 27 2010 20:47:00

A year after a Washington, D.C., subway crash killed nine people and injured dozens, federal accident investigators on Tuesday blamed faulty track circuits for the wreck, but also criticized the numerous local and federal entities entrusted with keeping passengers safe.

Jet engine failures overseas prompt 'urgent' NTSB recommendation hereupdated: Fri May 28 2010 08:28:00

The failure of General Electric engines on four jet aircraft overseas during the past two years has prompted the National Transportation Safety Board to issue an "urgent" recommendation to increase inspections of the engines on U.S. aircraft.

Two crashes in less than a decadeupdated: Sun May 09 2010 22:00:00

CNN's Susan Candiotti looks at the 2nd crash in less than a decade for a Staten Island ferry.

Conditions normal before ferry crash, chief engineer tells NTSBupdated: Sun May 09 2010 22:00:00

Early interviews with the chief engineer of a ferry that crashed into the Staten Island terminal in New York City indicate all conditions were normal before the incident, investigators with the National Transportation Safety Board said Sunday.

NTSB: Pilot of plane had mere seconds to see rising helicopterupdated: Wed Apr 28 2010 21:20:00

The pilot of a small plane that collided with a sightseeing helicopter over New York's Hudson River last summer had scant seconds to see the helicopter as it rose to his altitude, but the plane pilot apparently attempted evasive action immediately before the collision, NTSB documents released Wednesday show.

NTSB: Wayward Northwest pilots awake but distractedupdated: Thu Mar 18 2010 20:32:00

The pilots of Northwest Flight 188 did not fall asleep when they overflew their destination by more than 100 miles in October, the National Transportation Safety Board said Thursday in a detailed report on the wayward flight.

Pilot error caused 2009 crash near Buffalo, NTSB rulesupdated: Thu Feb 04 2010 10:54:00

Confronted with signs that his plane was entering an aerodynamic stall, the pilot of Continental Flight 3407 pulled on the plane's control column when he should have pushed -- a simple but inexplicable error that led to the death of 50 people, the National Transportation Safety Board ruled Tuesday evening.

Pilots of wayward flight talk to NTSBupdated: Tue Oct 27 2009 16:49:00

Federal investigators have interviewed the pilots of a Northwest Airlines flight that overshot the airport in Minneapolis, Minnesota, last week, a National Transportation Safety Board spokesman said on Sunday.

Feds look at instruments, approach lights in taxiway landingupdated: Wed Oct 21 2009 20:30:00

Federal investigators trying to determine why a Delta Air Lines jet landed on a taxiway instead of the runway in Atlanta on Monday morning say the runway was illuminated, but that approach lights and a ground-based instrument that helps pilots line up with the runway were off.

D.C. train crash probe prompts nationwide rail alertupdated: Tue Sep 22 2009 21:35:00

Federal safety investigators said Tuesday they fear flaws found in Washington's Metro subway system after a deadly crash this summer may endanger other transit systems, and they sent out an urgent recommendation asking that other rail operators check for similar problems.

New NTSB chief bans staff's cell phone use while drivingupdated: Tue Sep 08 2009 16:08:00

The new chairwoman of the National Transportation Safety Board announced a policy Tuesday banning agency employees from phoning or texting while driving on the job.

NTSB calls for new air traffic rules over Hudson Riverupdated: Thu Aug 27 2009 21:23:00

The rules governing air traffic over New York's Hudson River need to be rewritten to prevent another mishap like this month's fatal collision of a small plane and a sightseeing helicopter, federal safety investigators said Thursday.

Hudson air crash probe focuses on controller; union cries foulupdated: Fri Aug 14 2009 22:54:00

Investigators probing last weekend's fatal aircraft collision over New York's Hudson River focused Friday on an air traffic controller, though union leaders angrily said the controller could have done nothing to prevent the crash.

New Hudson collision videoupdated: Fri Aug 14 2009 22:54:00

Retired airline captain Jim Tilmon joins Anderson to analyze new video of the collision above the waters of the Hudson River.

Co-pilot on fatal flight thought about not making tripupdated: Tue Jul 28 2009 07:52:00

The co-pilot of a plane that crashed in Buffalo, New York, in February was feeling ill and had considered backing out of the flight, according to a cockpit voice recorder transcript released Monday by the National Transportation Safety Board.

DC Metro crash hearing reveals frustrations, harrowing memoriesupdated: Tue Jul 14 2009 22:04:00

The cause of a deadly Washington Metro subway crash last month remains a mystery, with one problem identified by investigators persisting even after engineers replaced a key part that was believed to be faulty, a top Metro official said Tuesday

NTSB: Sleep disorder may have contributed to Boston train crashupdated: Tue Jul 14 2009 17:20:00

A Boston trolley operator killed in a crash last year likely had a sleep disorder and fell into a "micro-sleep" shortly before the collision, the National Transportation Safety Board ruled Tuesday.

Metro crash probe prompts NTSB 'urgent' recommendationupdated: Mon Jul 13 2009 20:31:00

In the wake of a deadly June accident, the National Transportation Safety Board on Monday put out a rare recommendation for the Washington Metro to install a system that would automatically warn operators if train sensors behave erratically.

NTSB says train detection system failed in days before D.C. crashupdated: Wed Jul 01 2009 18:26:00

Officials investigating last week's crash of two Metro subway trains said a system used to detect trains in the area of the accident had failed intermittently in the days immediately before the fatal crash.

Student twice puts planes on runway collision courseupdated: Wed Jul 01 2009 07:51:00

A student controller was directing planes during two runway mishaps in the past month at Cleveland Hopkins International Airport, apparently giving instructions that placed planes on possible collision courses, federal investigators say.

NTSB to probe problems on other Airbus flightsupdated: Fri Jun 26 2009 13:18:00

United States accident investigators are probing two recent failures of airspeed and altitude indications aboard Airbus A330s -- the same type of plane that crashed into the Atlantic nearly a month ago.

Time running out to find Air France 447's 'black boxes'updated: Fri Jun 26 2009 08:19:00

Investigators probing the deadly crash of Air France flight 447 over the Atlantic are running out of time to find the flight data recorders which could prove crucial to working out what caused the disaster.

Officials say crash like D.C. Metro not likely in other citiesupdated: Thu Jun 25 2009 16:18:00

The trains that crashed on the Washington Metro depended on a 33-year-old automated control system widely used in cities across the United States, according to the American Public Transportation Association.

NTSB warned about trainsupdated: Thu Jun 25 2009 04:49:00

The NTSB had previously issued a warning about the kind of train that crashed in Washington this week.

NTSB to start hearings on plane's Hudson River landingupdated: Mon Jun 08 2009 23:10:00

The National Transportation Safety Board on Tuesday will launch three days of hearings into the circumstances surrounding the US Airways Flight 1549 emergency landing on New York's Hudson River.

Pilot fatigue is like 'having too much to drink'updated: Fri May 15 2009 21:03:00

Co-pilot Rebecca Shaw traveled all night as a passenger aboard FedEx planes before she got on the commuter plane that nosedived into a house near Buffalo, New York, killing all 49 passengers on an icy February evening.

Pilot, co-pilot lacked sleepupdated: Fri May 15 2009 21:03:00

The flight crew of the Colgan Air plane didn't have adequate sleep before flying. CNN's Allan Chernoff reports.

Crew of crashed plane being used as 'scapegoats,' relative saysupdated: Thu May 14 2009 17:21:00

The mother of the co-pilot who died in a plane crash near Buffalo, New York, in February, said Thursday that her daughter and the pilot were "being used as a scapegoat."

Source: Wrong move possibly made before Buffalo plane crashupdated: Wed Mar 25 2009 18:26:00

The crew of a commuter plane that crashed outside Buffalo, New York, in February may have responded improperly to signs the plane was stalling, according to details of the investigation released Wednesday.

'Urgent' repair recommended for some Boeing 777 enginesupdated: Thu Mar 12 2009 13:21:00

Federal transportation safety officials Wednesday issued an "urgent" recommendation calling for a redesign of a component on some Boeing 777 aircraft engines -- a component blamed for two major mishaps in the past year.

NTSB: Bird strike may have preceded fatal helicopter crashupdated: Mon Feb 23 2009 14:33:00

The National Transportation Safety Board said Monday that a bird strike may have preceded the January 4 crash of a Sikorsky helicopter near Morgan City, Louisiana.

Prescription drugs impaired tanker-crash pilot, feds sayupdated: Wed Feb 18 2009 23:06:00

The pilot of a tanker that crashed into the San Francisco Bay Bridge in 2007, causing a major oil spill, was under the influence of multiple prescription medications that impaired his judgment, federal officials said in a report Wednesday.

NTSB: Identical aircraft landed 27 minutes behind fatal flightupdated: Mon Feb 16 2009 17:52:00

Trailing what would become a fatal flight by some 27 minutes, the same kind of aircraft operated by the same airline traveled the same route last week and landed safely, the NTSB said Monday.

NTSB: Plane rolled violently before crashupdated: Mon Feb 16 2009 11:20:00

A commuter airliner that crashed Thursday in upstate New York, killing 50 people, underwent violent pitching and rolling seconds before impact, with passengers experiencing twice the normal force of gravity, a federal investigator said Sunday.

Autopilot on during crash?updated: Mon Feb 16 2009 11:20:00

The NTSB says it appears the autopilot was on at the time of the crash - a violation of policy. CNN's Ines Ferre reports.

Canada geese brought Flight 1549 down, NTSB saysupdated: Thu Feb 12 2009 18:05:00

Canada geese got into both engines of US Airways Flight 1549 and forced the plane to ditch into the Hudson River last month, the National Transportation Safety Board said Thursday.

NTSB: Bird remains found in Hudson plane's enginesupdated: Wed Feb 04 2009 18:08:00

The National Transportation Safety Board said Wednesday that both engines of the US Airways flight that ditched last month into the Hudson River contained bird remains.

NTSB hearings probe medical helicopter crashesupdated: Tue Feb 03 2009 13:58:00

The National Transportation Safety Board began four days of hearings Tuesday on how to stem the "drastic increase" in medical helicopter accidents.

NTSB probes copter crashesupdated: Tue Feb 03 2009 13:58:00

The NTSB begins hearings to determine how to stop the increase in medical helicopter accidents.

Flight 1549 pilot gets warm welcome in hometownupdated: Sun Jan 25 2009 10:54:00

The pilot who made a treacherous crash-landing on New York's Hudson River look like a routine maneuver got a hero's welcome Saturday in his California hometown.

A homecoming for Sullyupdated: Sun Jan 25 2009 10:54:00

Danville, California welcomes home Capt. Chesley "Sully" Sullenberger, the hero of the Hudson. CNN's Dan Simon reports.

Investigators find feather, other evidence on downed planeupdated: Wed Jan 21 2009 19:49:00

Investigators have found a single feather and evidence of "soft-body impact damage" on the US Airways jetliner that was ditched in the Hudson River near Manhattan last week.

Plane in Hudson tells story of what went right, NTSB saysupdated: Fri Jan 16 2009 23:01:00

The National Transportation Safety Board and other agencies are investigating not only what went wrong, but also what went right Thursday when a US Airways flight ended in the Hudson River without any deaths or major injuries.

NTSB calls weather, low light factors in 3 copter crashesupdated: Thu Jan 15 2009 12:58:00

Flying at night in poor weather conditions probably contributed to the crashes of three medical helicopters that killed 11 people in 2007 and 2008, the National Transportation Safety Board said Thursday.

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