Alaska Airlines will temporarily ground its fleet of 65 Boeing 737 MAX 9 BA.N aircraft after a cabin panel blowout forced a jetliner loaded with passengers to make an emergency landing on January 5, CEO Ben Minicucci said.A still photograph from inside the plane showed a missing panel in the cabin and oxygen masks hanging above seats.Alaska Airlines Flight 1282, which had been bound for Ontario, California, suffered the incident soon after departing at 5:06 p.m. Pacific Time and landed safely back at Portland, Oregon, at 5:26 p.m. with 171 passengers and six crew, according to the airline and Flightradar24 data.The National Transportation Safety Board said it was investigating the depressurization incident. The Federal Aviation Administration also said the crew had reported a pressurization issue, and that it would investigate.The MAX 9 features a rear cabin door behind the wings that can be activated in dense seating configurations to meet evacuation requirements, Flightradar24 said.However, those doors are permanently “plugged”, or deactivated, on Alaska Airlines jets.Last week, Boeing said it was urging airlines to inspect all 737 MAX airplanes for a possible loose bolt in the rudder control system. The FAA has carefully scrutinized the MAX for years. The FAA in 2021 said it was tracking all 737 MAX airplanes using satellite data.