the us national transportation safety board has revealed new details about the door plug that blew off an alaska air jet last month. the 737 max jet left a boeing factory missing four bolts designed to secure the door panel. our north america business correspondent erin delmore has more. this investigation focuses on the bolts used to keep the door in place on the plane. that door is not supposed to open. but it did open onjanuary five and flew off the alaska airjet just after takeoff in portland. now, investigations from the national transportation safety board said the bolts were missing before january five and it appears the alaska airport plane left boeing s factory without the bolts. they were removed to make a repair but it appears not all the bolts were replaced. this is a most diesel we have about what went wrong and it puts the blame on boeing. both details. a supplierfound new boeing. both details. a supplier found new problems with holes drilled on 737 max pl