the ntsb is trying to get to the bottom of the explosive accident on an alaska airlines flight that left behind a refrigerator-sized hole in the plane and of course tearrrified passengers. happened on a max 9 jet. those jets are grounded this morning. hundreds of flights canceled, and an investigation, of course, under way after that chunk of the aircraft blew off in midflight. the fuselage door that was a plug, it ripped off from the side of the plane shortly after it took off from portland, oregon, on friday night. overnight, a portland school teacher found that door plug in his yard. we re learning this plane had just been restricted from certain long-haul flights. cnn with the timeline of exactly