The Associated Press reports:
Federal regulators have threatened to ground dozens of Southwest Airlines jets if the airline can’t confirm that the planes, which it bought used from foreign operators, meet all safety standards.
The Federal Aviation Administration said Monday it has validated some major repairs to the planes, and it is asking Southwest for more frequent updates until the airline completes documenting maintenance on 38 jets by the end of January.
Southwest said repairs on some used Boeing 737 jets it bought were done but not properly classified by previous owners. Southwest downplayed any risk to safety.