WASHINGTON, Nov 10 (Reuters) - Airlines on Monday

canceled more than 1,000 U.S. flights for a fourth consecutive

day as government flight cuts and air traffic staffing absences

continue to wreak havoc with aviation.

FlightAware, a flight tracking website, said by 7:45 a.m. ET

(1245 GMT), more than 1,550 flights had been canceled and 1,200

delayed Monday after 2,950 flights were canceled and nearly

10,800 delayed Sunday in the single worst day for flight

disruptions since the government shutdown began on October 1.