By David Shepardson

WASHINGTON (Reuters) -Airlines canceled more than 1,500 U.S. flights on Monday, the fourth consecutive day cancellations have topped 1,000 as government flight cuts and air traffic staffing absences continue to wreak havoc with aviation.

FlightAware, a flight tracking website, said by 8:30 a.m. ET (1330 GMT), more than 1,550 flights had been canceled and 1,400 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.

A November winter storm in Chicago also disrupting air travel.

The Federal Aviation Administration late Sunday said it was suspending general aviation traffic at 12 airports with air traffic control staffing issues including Chicago O

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