Six Muslim scholars who were kicked off a US Airways flight last fall have filed a lawsuit claiming the airline discriminated against them and violated their civil rights. The imams, most of whom are from Arizona, were returning from a religious conference in November when they were taken off a plane in Minneapolis, handcuffed and questioned. They had prayed on their prayer rugs in the Minneapolis-St. Paul International Airport before the flight, and after they boarded, a passenger passed a note to a flight attendant. The 39-page complaint, filed Monday in federal court in Minnesota, seeks an undisclosed amount of money for punitive and compensatory damages. Besides US Airways, the lawsuit names the Minnesota Metropolitan Airports Commission, the owner of the airport, as a defendant.