The Alaska Airlines jet whose door blew off in mid-air was apparently missing bolts that should have been installed by Boeing employees when it rolled off of the aircraft manufacturer’s assembly line, according to a report.An investigation into the incident revealed that Boeing employees may have failed to put back the bolts that would have sealed the plug door that was ripped off the 737 Max 9 aircraft as it flew 16,000 feet over Oregon in a Jan. 5 flight to California, according to The Wall Street Journa ...