Nearly 70 people were killed in an aircraft collision Wednesday night near Washington, D.C. Are flights being delayed or canceled?

The deadly mid-air collision over Washington, D.C., has reignited concerns over air traffic congestion and safety risks at Ronald Reagan Washington National Airport, a tightly packed aviation hub that shares airspace with military and government flights.

Ronald Reagan Washington National Airport is known for its close proximity to Washington, D.C., but after its first deadly plane crash in more than four decades, several of the airport’s difficulties are under scrutiny.