Regulators have largely ignored a series of dangerous incidents in which cockpit windshields in commercial airliners shattered in midflight, sometimes forcing emergency landings, according to an American Airlines pilots' group.
Since 2004, at least 10 windshields have had problems on Boeing 757s, mostly the result of wiring problems with windshield heaters that cause smoke to fill the cockpit and sometimes make those windshields crack, according to the National Transportation Safety Board. Four incidents have been on American Airlines planes, the NTSB says.
An American Airlines flight from San Juan, Puerto Rico, to Philadelphia, Pennsylvania, made an emergency landing January 30 after the cockpit filled with smoke.
The inner pane of the co-pilot's window shattered as the plane came in to land in Palm Beach, Florida. One of the crewmembers was injured by glass, and six passengers were treated for smoke inhalation.
Another pilot said he had a similar experience on a 757 more than two years ago but did not want to be identified for fear of retaliation. Watch a report on the pilots' claims 
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CNN's Todd Schwarzschild contributed to this report.
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