A United Airlines flight from Los Angeles to Shanghai was forced to return midair after a pilot forgot his passport.

The mishap happened Saturday afternoon on United Flight 198 from Los Angeles International Airport to Shanghai Pudong International Airport. Data on FlightAware.com showed the flight took off on time just before 2 p.m. but was diverted to San Francisco, where it landed just after 5 p.m. There were 257 passengers and 13 crew members onboard.

Now stuck 6+ hours. Completely unacceptable. @united, what compensation are you offering for this total mishandling?”