Plane maker Boeing will allow representatives of its airline customers onto its production line to oversee work.
Airlines will be granted access into Boeing factories as well as contractor Spirit AeroSystems, which manufactures the Max 9 fuselage.
It follows the Alaska Airlines incident in which a door plug panel fell off mid-flight.
Boeing is also conducting extra quality control monitoring on the 737 Boeing Max production line.
The mid-air blowout led the Federal Aviation Administration to ground Max 9 aircraft impacting Alaska Airlines and United Airlines.
“These checks will provide one more layer of scrutiny on top of the thousands of inspections performed today,” Boeing said.
“Our team is also taking a hard look at our quality practices in our factories and across our production system.”
The FAA plans to audit production line practices and could appoint an independent monitor to oversee Boeing.
