Documents submitted by FAA inspectors to congressional investigators allege the airline flew at least 117 of its planes in violation of mandatory safety checks. In some cases,he planes flew for 30 months after government inspection deadlines had passed. These planes should have been grounded until the inspections could be completed. The planes were “not airworthy,” according to congressional air safety investigators. Calling it “one of the worst safety violations” he has ever seen, Rep. James Oberstar, D-Minnesota, is expected to call a hearing as soon as possible to ask why the airline put its passengers in danger.