National Transportation Safety Board
Southwest Airlines says it has finished inspecting planes grounded since the weekend.
Federal records show cracks were found and repaired a year ago in the frame of the Southwest Airlines Boeing 737-300 that made an emergency landing at an Arizona military base after a hole was torn from the passenger cabin.
Friday was a rough day in the skies for both North Texas-based airlines. A Southwest Airlines jet had to divert in Arizona just hours after an American Airlines flight had to land in Ohio.
Investigators are looking into what caused a hole to rip open in the fuselage of an airline jet as it cruised at 31,000 feet, causing a loss of cabin air pressure and forcing the pilot to make an emergency landing.