Large volumes pose challenges to air traffic control, which has faced severe staffing shortages for years, according to experts.

"Just the horror that the parents are going through — that blows me away," said Joanne Kispert, whose father died in the 2001 crash of AA Flight 587 in New York. "It makes me so sad for the families."

All 64 people aboard an American Airlines jet that collided with an Army helicopter were feared dead in what was likely to be the worst U.S. aviation disaster in almost a quarter century, officials said Thursday.

Aviation experts have warned for years about near collisions at airports around the US, citing air traffic control shortages and airspace congestion.

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

While landing at Ronald Reagan Washington National Airport in Washington, D.C., on Wednesday shortly before 9 p.m., American Airlines Flight 5342 collided with an Army Black Hawk helicopter and crashed into the icy Potomac River.

The camp serves as a launchpad for athletes vying for their spot on Team USA in the upcoming world championships.

An Army Black Hawk helicopter collided with a regional jet near Ronald Reagan Washington National Airport on Wednesday evening, U.S. officials confirmed to ABC News.

The plane collided with a military helicopter over the Potomac, killing 67 people. The four-member plane crew was based in Charlotte.

On Jan. 29, a CRJ700 regional plane collided with an Army Black Hawk Helicopter over Washington, D.C. There are not believed to be any survivors

With no survivors expected, the Jan. 29 midair collision between an American Airlines plane and a U.S. Army Black Hawk helicopter would make it the third deadliest commercial aviation disaster in the U.

An American Airlines regional jet collided with a military helicopter as it was approaching Reagan National Airport.