WASHINGTON (Reuters) -Airlines anticipate the Federal Aviation Administration will end 3% domestic flight reductions at 40 major U.S. airports early Monday, easing restrictions imposed over air traffic control safety concerns, sources told Reuters.

Late Friday, the FAA cut in half the flight-cut requirement from 6% to 3% but airlines have not been complying with the requirements. Carriers on Sunday canceled just 0.25% of flights at those 40 airports -- less than normal cancellations -- according to Cirium, an aviation analytics firm. The FAA and Transportation Department did not immediately comment late Sunday.