Southwest Airlines removed its Boeing 737 Max planes from service through Jan. 5, 2020, extending the cancellations amid continuing uncertainty over the Boeing aircraft’s ability to fly.

The carrier previously canceled these flights through Nov. 2, but said, “With the timing of the Max’s return-to-service still uncertain, we are extending the Max-related flight schedule adjustments.”

The plane is grounded around the world after two fatal crashes. Southwest said the decision to extend the cancellations will “proactively remove an average of more than 200 weekday flights from our schedule.”

In a statement the carrier said, “Southwest Airlines continues to monitor information from Boeing and the Federal Aviation Administration on the impending 737 Max software enhancements and training requirements. We remain confident that, once certified by the FAA, the enhancements will support the safe operation of the Max.

“By proactively removing the Max from scheduled service, we can reduce last-minute flight cancellations and unexpected disruptions to our Customers’ travel plans. The limited number of Customers who have already booked their travel and will be affected by our amended schedule will be notified of their re-accommodated travel according to our flexible accommodation procedures.”