Flight 21 then apparently continued across a small valley in the same direction in level flight for about 1,500 feet ( 460 m ) before the right wing tip struck the top of a poplar .
The aircraft crashed into a thick grove of pine trees .
Flight 21 then apparently continued across a small valley in the same direction in level flight for about 1,500 feet ( 460 m ) before the right wing tip struck the top of a poplar and the aircraft crashed into a thick grove of pine trees .