yet the airliner says boeing and its 777, the same model of plane missing, is also partly to plane. it says the plane's navigation instruments, airplane software, led the crew to believe the jet was maintaining enough speed to land safely. in its own documents, boeing says not so. placing the blame squarely on the pilots. the equipment it says had been functioning normally. >> there's almost 1200 or so 777s flying around. that hasn't been a problem with any of the other carriers that i'm aware of. >> reporter: according to mark weiss, the airline has a weak argument, maintaining that safe air speed is -- >> the bottom line it's the pilot's job to maintain safe air speed at all times. that may go back to a fundamental problem of skill sets or training. >> reporter: the federal aviation administration urged boeing in 2010 to update its