BISMARCK, N.D. — A federal judge in North Dakota has granted a sixth trial delay for a flight attendant accused of disrupting SkyWest Airlines flights in the Upper Midwest and on the East Coast last year.

Justin Cox-Sever’s attorney asked for more time “to locate witnesses, to complete the investigation, and to prepare for trial,” and the government did not object. U.S. District Judge Daniel Hovland moved Cox-Sever’s trial from early October to early December in Bismarck. The trial originally was scheduled for last December.

Cox-Sever, of Tempe, Arizona, is accused of fabricating bomb threats on a July 2015 flight from Charlottesville, Virginia, to Chicago, and on a September 2015 flight from Minneapolis to Dickinson, North Dakota. The first plane turned around mid-flight, and the second incident resulted in the temporary shutdown of the Dickinson airport.

Cox-Sever could face up to 40 years in prison if convicted, though prosecutors have told The Associated Press that a plea deal is likely. Cox-Sever’s defense attorney has said only that all options are on the table.

Cox-Sever is no longer employed by SkyWest. The airline won’t say whether he quit or was fired.