Federal workers have been ordered to return to work after the end of the government shutdown as they await back pay.

As the federal government shutdown continues, the FAA and the nation's air traffic control system are being increasingly affected, leading to delays at major airports across the U.S.

U.S. airlines have cut far fewer flights for Friday despite no change in a requirement that they cut 6% of domestic flights at the 40 busiest American airports, according to aviation analytics firm Ci...