hole is larger than first reported. >> the fracture area is five feet by one foot wide. a preliminary onsite inspection reveals preexisting fatigue along the entire fracture surface. >> reporter: the ntsb is cutting out the fracture surface so it can be more closely examined. they say they see no sign of faulty maintenance. >> we have no indications that something was actually missed in an inspection, something that could have been detected that wasn't detected. >> reporter: the plane's flight recorders are in washington. no one was seriously injured when the hole burst open at 36,000 feet friday. the plane lost cabin pressure and made a rapid emergency landing in yuma. records show the 15-year-old boeing 737-300 underwent repairs for at least a dozen fuselage cracks which experts say is routine. >> this is basically something that comes about with age and utilization. that's what they'll be focused in on. there's absolutely no indication here that this is something fleet-wide. >> reporter: little consolation to flyers on hundreds of southwest flights canceled so 80