“The plane’s tires are so bad that they’re not going to last.
It’s just a sad sight,” said Mark Schuler, a passenger.
The airport is about 90 minutes west of San Francisco.
The pilot has told the airline to bring back the plane.
A spokeswoman for United Airlines says the company is not taking action, but that the company has made arrangements to bring the plane back to the airport.
A spokesman for Delta Airlines said they are cooperating with authorities.
A flight from Denver to Dallas was delayed and diverted after a flight attendant stopped the plane in Denver, officials said.
The plane was being moved to Denver International Airport in the afternoon.
The spokeswoman for Delta said in a statement the company “is aware of the incident and is cooperating with the FAA and the Department of Homeland Security.”
United Airlines is taking some actions to prevent this from happening again.
The airline said that it is working with the airlines to bring planes back to Denver.
The spokesman said the company’s “principal flight attendants have been placed on leave and that flight operations will be re-assessed in the coming days.”
Delta Airlines said the airline is cooperating fully with authorities and is providing a list of aircraft available to passengers.
United said that the airline has arranged for the plane to be returned to Denver, but it’s not clear when.
The FAA is looking into the incident, but is not ruling out the possibility of an intentional act of terrorism.
On Wednesday, a United Airlines flight was diverted to Los Angeles after a passenger allegedly said he had been targeted by Islamic extremists, the company said in an emailed statement.
United, Delta and other airlines have been making adjustments to flights to avoid the incident.
Delta said the airport is “working with authorities to reroute the flight to Denver” and that it has made changes to ensure the safety of its passengers.