The White House says the vice chair of the National Transportation Safety Board has been removed from his position, a rare move that comes as the federal agency charged with investigating aviation disasters juggles more than 1,000 cases.

A federal review of helicopter safety around some of the busiest U.S. airports has revealed dangerous flying conditions at the Las Vegas airport.

The National Transportation Safety Board says a cockpit voice recorder was not working on a medical transport plane that crashed in Philadelphia in January and likely had not been working for several years.

Experts say a combination of training and technology were critical to all 76 passengers and four crew members surviving the fiery Delta Air Lines plane crash in Toronto.