In the three years before the deadly collision between an Army helicopter and an American Airlines flight near Reagan National Airport, at least two other pilots reported near-misses with helicopters while landing at the airport,

Various government agencies will be involved in the investigation to determine what led up to the midair collision Wednesday night at Reagan National Airport.Experienced pilot and aviation attorney Arthur Wolk told CBS News Philadelphia we don't have midair crashes often in this country because the whole aviation system works in a meticulous fashion,

An Army Black Hawk helicopter collided midair with an American Airlines flight from Wichita, Kansas, at Reagan National Airport on Wednesday.