Alaska Airlines jet had three pressurization warnings before emergency landing

Alaska Airlines pilots reported pressurization warning lights on three earlier flights of a two-month-old Boeing 737 MAX 9 jet that made an emergency landing on Friday after a door plug tore off.

National Transportation Safety Board (NTSB) Chair Jennifer Homendy said late on Sunday the auto pressurization fail light illuminated on Dec. 7, Jan. 3 and Jan. 4, but she said it was unclear if there was any connection between those incidents and the rapid depressurization incident.