>> one of the big questions here do is we have to revamped meth ofd nondestructive inspection we're use all runtd world? railroad the section that broke apart. it will undergo detailed analysis in washington. >> all requires aircraft inspections were up to date and no deskrep andsies were found. >> reporter: the faa is man dlt dating specific early boeing 737s undergo full inspections for fatigue damage. about 175 aircraft are covered under the mandate, 80 which registered in the u.s., most flown by southwest. t.j. winick, abc news, new york. very interesting the concept of plane fatigue. some reports are saying that because southwest flight patterns, a lot of takeoffs and landings, other people remember the hawaiian flight with the interisland hops and they say the salty air can cause soft of disintegration of the planes. both very frightening ideas. >> people were concerned when