Boeing has said it doesn't expect its 737 Max plane to return to the skies before the summer, which is longer than initially expected.
The jet has been grounded since March after two fatal crashes, which together killed 346 people.
Boeing has been working on fixes to try to get the 737 Max planes back up and running.
But the company has struggled to convince regulators that the planes are safe to fly.
It previously said it expected the planes to be cleared for approval before the end of 2019. But in December, Boeing announced plans to halt production of the aircraft and last week, it confirmed it had found a new problem in the software.