Boeing is set for a crucial flight test Monday (June 29) to see if its 737 Max jet can take to the skies again.
That's according to sources who say the test is slated to take off near Seattle.
The 737 Max was grounded after two crashes together killed all 346 people on board.
So Monday marks a pivotal moment in the worst corporate crisis Boeing has faced.
Before the crashes - the 737 Max was Boeing's best-selling plane.
The company has also been disrupted by the coronavirus pandemic, with little appetite for air travel or new planes.
Boeing has declined to comment on the story.
However, the U.S Federal Aviation Administation (FAA) confirmed it completed a review of the plane's safety system on Sunday.
They said Monday's test flights would evaluate the 737 MAX automated flight control system.
The FAA also said in an email that pilots will intentionally trigger the reprogrammed stall-prevention software known as MCAS that faulted in both crashes.
The agency added that it has not made a decision on whether the jet can return to service and even if the test does go well, a new pilot training procedure will need to be approved among other reviews. .
The sources say that the plane's return would not likely be approved until September.