US authorities say more Boeing 737 planes should get checks after door plug blowout

Issuing a safety alert, FAA recommends that airlines inspect the door plugs of Boeing 737-900ER jets

Another Boeing jet faces scrutiny after the US aviation watchdog issued a safety alert and advised airlines to check that door plugs are secure.

Boeing was already working to reassure carriers, regulators and passengers after a cabin panel blew off a brand-new 737 Max 9 jet during an Alaska Airlines flight earlier this month. Some 171 Max 9 jets have since been grounded.