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,

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 agency investigates more than 1,000 cases

The removal of the vice chair of the independent safety board is highly unusual and comes as the agency is investigating several high-profile calamities.