The plane-maker's order and delivery totals have plummeted since the grounding of its troubled 737 Max jet.
The embattled plane maker said Saturday it “made corrections" to the simulator software used to train some Boeing pilots.
French officials said such a move could cause the entire structure to collapse.
The company's decision cancels about 1.5 percent of its daily summer flying schedule.
After weeks of speculation, Ethiopian investigators have provided the first official glimpse into what went wrong in the second 737 Max 8 crash in five months.
The preliminary report recommends that the flight control system should be reviewed by Boeing.
The plane's anti-stall software appeared to repeatedly engage before the jet plunged to the ground, sources said.
A Southwest Airlines flight was forced to return to Orlando, Florida, after pilots declared an engine-related emergency.
Boeing says its safety review met "all certification and regulatory requirements" set by the FAA.
“All of those planes are grounded effectively immediately,” the president said hours after Canada grounded the aircraft following the Ethiopian Airlines crash.
The Federal Aviation Administration said there was "no basis" to ground the plane, despite the recent crash in Ethiopia.
The FAA has resisted calls from Sens. Elizabeth Warren, Mitt Romney and others to ground the aircraft until a full investigation is complete.
Boeing has said it has no reason to pull the aircraft from the skies.
Two airplanes of the same model were involved in crashes within five months, including an Ethiopian Airlines flight on Sunday.
Some 157 people, including 8 Americans, were killed when an Ethiopian Airlines Boeing 737 MAX 8 jetliner crashed shortly after takeoff.
Investigators located the black box from the crashed Ethiopian Airlines flight, though it is partially damaged.
The Nairobi-bound flight crashed six minutes after departing Addis Ababa.