OKLAHOMA CITY (AP) — A Los Angeles man pleaded guilty to interfering with a flight attendant, causing a California-based flight to be diverted to Oklahoma City, federal prosecutors announced on Thursday.

Ariel James Pennington, 35, faces up to 20 years in prison and a $250,000 fine when he's formally sentenced later this year, U.S. Attorney Robert Troester said in a statement.

Pennington was initially charged with a second count of assaulting a federal air marshal on the same flight, but prosecutors agreed to dismiss that count as part of a plea agreement.

A message left with Pennington's atto...