The presidential helicopter was involved in a so-called “loss of standard separation,” which requires aircraft to be at least 1.5 miles horizontally and 500 feet vertically away.

An American Airlines jet carrying 64 people collided Wednesday with a helicopter near Reagan Washington National Airport, with no survivors expected.

A small airplane collided with a Pennsylvania State Police helicopter during a training exercise at Carlisle Airport on Wednesday evening, killing the pilot and injuring two troopers, officials said.