Alaska Airlines and United Airlines have canceled hundreds of flights this weekend that were scheduled to be flown using the Boeing 737 MAX 9, which has been grounded for inspections after a panel blew off the fuselage of a flight from Portland, Oregon, on Friday and caused a cabin depressurization. Alaska and United are the two main U.S. air carriers that operate the Boeing 737 MAX 9, one of which lost a door plug panel on an Alaska flight at about 16,000 feet of altitude after taking off from Portland on ...