WASHINGTON (Reuters) -Major U.S. airlines are urging the Federal Aviation Administration to drop mandatory 6% domestic flight cuts at 40 major airports imposed to address air traffic safety concerns after the end of a record setting government shutdown. Airlines are largely not in compliance with the FAA order that requires much steeper cuts. Cirium, an aviation analytics firm, said airlines canceled just 2% of overall flights Friday, down from 3.5% Thursday. On Friday, air traffic controllers and other FAA employees began receiving partial back pay, the FAA and union officials said. (Reporting by David ShepardsonEditing by Nick Zieminski) (The article has been published through a syndicated feed. Except for the headline, the content has been published verbatim. Liability lies with original publisher.)