The plane suddenly jolted shortly after takeover then felt like it was falling, said Stef Zamorano, who was flying to Las Vegas with her husband to celebrate his birthday.

A Southwest Airlines flight dropped several hundred feet in a matter of seconds to avoid a midair collision, after the Federal Aviation Administration said pilots were alerted to another aircraft's presence in the area.

Passengers said the pilot of a Southwest Airlines flight had to "dive aggressively" in order to avoid a midair collision over Burbank.