United Airlines has said it is investigating an incident in which a pilot said to have been talking to passengers over the intercom about divorce and the US election was removed from a San Francisco-bound flight before it left Austin, Texas.
Airline spokesman Charlie Hobart said the pilot was not in uniform when she boarded the plane on Friday.
He said another pilot was brought in and the flight was delayed for about two hours.
Mr Hobart also confirmed the pilot was the woman shown in videos posted on social media talking to passengers over the intercom.
Some people tweeted they were passengers on the flight and that the woman seemed unstable, talking about a divorce, the election and other issues.
Mr Hobart says he did not immediately have details about the incident, including why the pilot was allowed on the plane in plain clothes or if anyone thought something was amiss before she boarded.
He said the company would discuss the incident with the pilot.