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The plane that cracked open in mid flight last fright had undergone a major maintenance inspection in march of last year. investigators believe the problem began with a crack in the lap joint in a part of the fuselage where only visual inspections are required. >> these cracks are developing on the underside of the lap joint, which you cannot see with the naked eye. you need a more comprehensive method of determining these cracks that's what ultrasound or x-ray can find that the naked eye can't see. >> let's look at today's federal directive ordering emergency inspections of these older boeing...

Inspections for fatigue damage after this frightening episode on the southwest airlines flight last friday night. at 35,000 feet t fuselage of the phoenix to sacramento southwest flight ripped open leaving a gaping hole five feet long. passengers described a loud noise. >> all of a sudden there's a big sunroof in the middle of the plane, a big old hole. >> assault the oxygen masks dropped. everyone was trying to get the mask on. >> i'm holding the hand of the guy next to me trying not to bawl my eyes out. >> reporter: after an emergency landing at a military base in arizona, the damaged sectio...

Eyeballing these planes to check for precisely this? >> well, they are eyeballing it, using your term, but there are various types of inspections done every day. some only require a visual inspection, looking for the more obvious things, the larger cracks and that kind of thing. in this particular area, the lap joint, the cracks are developing on the underside of the lap joint which you cannot see with the naked eye. you need to have a more comprehensive way of determining these cracks. the naked eye can't see it. >> so given those three different methods to detect these microscopic cracks, wi...

Flights on saturday, several hundred on sunday, and the focus has been on the 737 300s that might have cracking. any know that they saw significant cracking on that plane that made the emergency landing on friday in yuma. the question is whether other planes might have similar types of issues underneath what's called a lap joint, that is a joint when the different plates of metal on top of the plane sit on top of each other. underneath one of the plates they found the significant amount of cracking. pre-existing cracking prior to the hole being ripped open on friday night. so southwest has now...