A panel called a door plug blew off an Alaska Max 9 as it flew five kilometers above Oregon on January 5. The blowout left a hole in the side of the plane, but pilots were able to return to Portland and land safely. The FAA grounded most Max 9s the next day. Alaska and United Airlines - the only U.S. carriers with Max 9s - have canceled hundreds of flights since then, and United said this week that it will lose money in the first three months of this year because of the grounding.