Airliners have had to abandon landings at National to keep away from helicopters, underscoring officials’ ongoing challenge to keep the busy airspace safe.

If a helicopter must fly through the airspace on an urgent mission, such as lifesaving medical, priority law enforcement, or Presidential transport, the FAA will keep them specific distances away ...

STOCKHOLM -- Robbers used a helicopter today in a spectacular raid of a cash depot in Stockholm, breaking into the building through the roof and flying off with bags of cash, police and witnesses ...