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United and Alaska airlines say they found loose parts in door panels during the Boeing 737 Max 9 inspections; Indonesia also grounded the planes.
The longer-term effects on Boeing and for airlines such as Ryanair, which has placed one of the world's largest orders for the Max 10 planes, are still unknown
Shares in Boeing fell as much as 8% in pre-market trade on Monday, wiping $12 billion off the aerospace giant's stock market value.
A door plug tore off on Friday following takeoff from Portland, Oregon, en route to Ontario, California, depressurizing the plane and forcing pilots to turn back.
The airline said it would "temporarily" ground all 65 of its 737 Max 9 aircraft to conduct inspections.