The LaGuardia Airport crash, which killed the pilot and co-pilot of an Air Canada jet, has raised concerns about the strain on already strained air traffic control in the US. The incident occurred just before an AirCanada jet collided with an airport fire truck. The Air Traffic Cont Association emphasized that air traffic controllers work every day to keep passengers and cargo moving safely and efficiently. The National Transportation Safety Board is investigating whether fatigue could have played a role in the crash. Transportation Secretary Sean Duffy declined to disclose how many controllers were on duty at the airport when the crash occurred. The airport's tower is generally "well staffed" and just short of its target of 37 controllers.