The U.S. air travel industry has begun to feel the sting of a lengthening government shutdown amid delayed training for new pilots and air traffic controllers coupled with an uptick in sick leave by transportation security employees required to work without pay.

President Trump is slated to give a national address on Tuesday on the now 18-day shutdown of departments including the Transportation Security Administration, a lapse prompted by White House demands that Congress provide more funding for a wall along the U.S. border with Mexico than lawmakers have been willing to give.

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