TULSA, Oklahoma -- Southwest Airlines canceled more flights Monday, while it checks dozens more of its Boeing 737-300s for cracks.
Investigators suspect cracks caused a plane to lose pressure Friday, tearing a hole in the passenger cabin roof and forcing the pilots to make an emergency landing in Arizona.
So far on Monday, Southwest flight 1599 to Tulsa from Denver arriving at 9 a.m. and leaving Tulsa for Dallas at 9:20 a.m. was canceled.
The airline canceled about 600 flights nationwide over the weekend. Southwest spokeswoman Brandy King says Southwest has inspected 33 similar planes and returned them to service and expects to complete checks on remaining grounded planes by late Tuesday.
Southwest says customers should continue to check flight status at www.southwest.com for any changes to their flights as a result of inspections and out-of-service aircraft.