The Federal Aviation Administration is investigating Southwest Airlines and how unauthorized aircraft parts were used on 42 airplanes, according to the Wall Street Journal.
The FAA wants to know why the carrier’s maintenace operations didn’t catch the parts.
The parts in question protect movable panels on the wings from being damaged by hot engine exhaust. Though the FAA said there’s no immediate safety risk, it did ground all of the planes temporarily this weekend.
Only 68 percent of Southwest’s planes were on time on Saturday, a Southwest spokesperson said. They’re usually about 90 percent on time.
