WASHINGTON, Nov 10 (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'Hare and

Reagan Washington National.

The shutdown, which has reached a record 40 days, has led to

shortages of air traffic controllers who, like other federal

employees, have not been paid for weeks.

The U.S. Senate voted to advance a bill to end the

government shutdown late on Sunday.

The FAA instructed airlines to cut 4% of daily flights

starting on Friday at 40 major airports because of air traffic

control safety concerns. Reductions in flights are mandated to

reach 6% on Tuesday and then hit 10% by November 14.

One big question for airlines is when will the FAA lift the

government-required flight cuts. Transportation Secretary Sean

Duffy has said he first wants to see air traffic control

staffing and safety data improve.