A woman who fell asleep on a flight to Philadelphia has said she was horrified to wake up and find herself alone on the plane.
Ginger McGuire said no-one had woken her when the United Express plane landed early on Tuesday, more than three hours earlier.
She said she paced the aisle for about 15 minutes until the locked door opened and police demanded identification.
"Waking up to an empty airplane and not being able to get out - it was very horrifying," Ms McGuire, 36, said, as her lawyer announced a lawsuit.
Ms McGuire, of Ferndale, a Detroit suburb, said she fell asleep after a long trip that stretched from Detroit, Michigan, to suburban Washington and, finally, Philadelphia. She said the plane landed on Tuesday about 12.30am.
United Airlines spokeswoman Sarah Massier declined to comment because the incident has led to a lawsuit. The Transportation Security Administration said it was investigating.
The United Express flight is operated by Trans States Airlines in partnership with United Airlines.
Ms McGuire's lawyer Geoffrey Feiger said his firm had filed a lawsuit against United and Trans States, alleging negligence, false imprisonment and distress.