Alaska Airlines again grounded all of its Boeing 737 Max 9 jetliners on Sunday after federal officials indicated further maintenance might be required to ensure that another inflight blowout like the one that damaged one of its planes doesn’t happen again.

THE CIVIL Aviation Authority of Thailand (CAAT) has ordered Thai Lion Air to immediately suspend the use of its three Boeing 737 MAX 9 aircraft on all routes for seven days, citing safety concerns.