Remains of 55 of the 67 victims have been recovered, officials said on Sunday as they prepared to lift the wreckage of the jet out of the Potomac River on Monday.

Transportation safety investigators are seeking to determine if the pilots of the American Airlines plane detected danger just before the midair crash with a helicopter.

Residents of Northeast Philadelphia looked on in disbelief after the crash on Friday night that also injured at least 19 people on the ground.

The Learjet, carrying a pediatric patient and five others, crashed on Friday, killing all on board. On the ground, one person was killed and at least 19 others were injured, officials said.

In 1990, Avianca Flight 52 crashed in suburban Long Island and a 17-year-old girl was pulled from the wreckage. Survival has been its own ordeal.

It is not uncommon for planes to strike wildlife, but most episodes don’t result in deaths or serious injuries.

Extreme turbulence, a blown-out door, an engine on fire: For passengers and crew members who have experienced in-air emergencies, the pain endures.

© Clayton Cotterell for The New York Times