Some were allegedly found with their hands tied and stripped of their clothes, spokeswoman Ravina Shamdasani said
The new timetable was well received by the market, with Boeing shares increasing 4.7 percent by around 2:30 pm (1930 GMT) on the New York Stock Exchange.
Southwest Airlines and American Airlines on Friday pushed back their time frame again for resuming flights on the 737 Max until early March.
Southwest, the largest Max customer at the time of the grounding with 34 of the aircraft, is currently doing without 175 flights per day out of a total of up to 4,000 while the planes are out of commission.
Companies also need to take into account the time needed to train pilots and install modified software on the aircraft before they can re-enter regular service.
Boeing said Monday it has completed the first of five milestones it must meet before returning the Max to service: a multi-day simulator evaluation with the FAA to "ensure the overall software system performs its intended function."
The group said it still needs to run a separate, multi-day simulator session with airline pilots to "assess human factors and crew workload under various test conditions," before FAA pilots conduct a certification flight of the final updated software.
Driven by a 67 per cent drop in commercial aircraft deliveries in the third quarter, Boeing's sales plunged 20.5 percent to $19.98 billion and its profits halved to $1.17 billion.
And while Boeing hopes for a resumption of commercial 737 Max flights in early 2020, uncertainty still looms.
The European Union Aviation Safety Agency had estimated in early November that it did not expect a resumption of Max flights in Europe before the first quarter of 2020 as it conducts its own test flights, assesses pilot training requirements and coordinates with EU member states.
The FAA, which has come in for widespread criticism for entrusting certification of important systems of the aircraft to Boeing, has promised a thorough review before certification.
Pilot training remains a contentious point, with Europe and Canada requiring training on flight simulators while American pilots will only have to go through faster computer-based training.
Some were allegedly found with their hands tied and stripped of their clothes, spokeswoman Ravina Shamdasani said
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