American, with 24 737 MAX aircraft and dozens more on order, is scheduling without the jets through November 2.
American, the world's largest airline and the second-largest 737 MAX operator in the United States, estimated that the continued suspension of these planes from its schedule through November 2, 2019, will cause approximately 115 flights to be canceled per day.
The FAA has said it is following a thorough process but has no timetable for when the recertification will be completed.
Airlines are planning for the possibility that Boeing's beleaguered 737 Max commercial jetliners will remain out of commission late into the fall, as the company works to fix a host of technical problems that have rendered the planes grounded since early March.
American Airlines has dropped its 24 Max planes from the schedule thru September 3, taking out about 115 flights a day.
Ryanair boss Michael O'Leary told AirlineRatings last week getting a dependable timeline of the MAX return to service was now a priority. So Boeing added a new flight control system called the Maneuvering Characteristics Augmentation System that can, in certain rare but risky situations, override pilots' controls and automatically tip the nose of the plane downward.
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The Boeing 737 was grounded worldwide following the deadly crashes of Lion Air Flight 610 in October and Ethiopian Airlines Flight 302 in March. That update is now finished, said a Boeing official speaking on the condition of anonymity because the person was not authorized to discuss the issue publicly.
Other aircraft returned similar numbers to last year, but the 767 jumped from the previous year's nine to 22, as Boeing ramped up production of the 767 tanker for the US Air Force.
The FAA did not give additional information about the new errors and sources said it is unclear if a software patch can resolve the issue.
Earlier this month, American became the first U.S. airline to ax a route due to the grounding.