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Because it's the cycles, it's that constant pressurization, depressurization, the working of the fuselage, if you will, that really accounts for the life cycle of the aircraft. so in this particular instance -- >> so wait, greg, a question. would a life cycle of an aircraft that is a longer-haul aircraft, is that a -- is that less stress on a plane than one that's taking off and landing so many times because they do shorter distance trips? >> yes. when you look at the number of cycles, like with southwest, because they can accumulate more cycles in a 30-day period than, like a 747, that's used...

Whether it's boeing or airbus. so, there are a lot of lessons to be learned. but for right now, i think that with the 737 out there, it's a very stout aircraft, it's been in service a long time, has a very good track record, and i fly constantly. i wouldn't -- it wouldn't be a problem for me to get on a 737 tomorrow. >> okay. well, it's good to hear from you. thank you very much, greg feith. >> take care, alex. what's happening behind the scenes at the white house to prevent a government shutdown? a look at the chances of a compromise. and a bit later, the attack of the giant pythons. no k...

Fuselage section that burst apart midflight to further examine it. greg fike is a former investigator for the ntsb. very good morning to you, greg. >> hi, alex. >> okay, first thing, as a former ntsb investigator, what are they doing right now on the ground as they look for the clues as to what happened here? >> they're doing a very careful examination of the failed part of the fuselage. they're looking for those kinds of cracks that have been talked about in the past with aging aircraft issues, but they're also going to be looking at other factors. could there have been other kinds of fatigue...

And a routine check last tuesday. nbc's francis co-has more. >> reporter: an investigation is under way into what caused a large hole to rip open in a southwest airlines 737-300. >> our mission is to determine not only what happened, but figure out why it happened so that we can prevent things like this from happening in the future. >> reporter: flight 812 to sacramento from phoenix had just reached cruising altitude when a large section of the plane's roof panel tore open. as the aircraft lost oxygen, the pilot descended to 11,000 feet. the plane was able to make an emergency landing in arizo...