The nation’s air safety agency allows the jet to resume flying after two years of review since a pair of deadly crashes.
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.