TULSA, Okla. (AP) — Workers at American Airlines’ Tulsa maintenance base said they were hopeful Monday that the bankrupt air carrier could reach labor agreements with pilots, flight attendants and mechanics.

American has said a bankruptcy court judge could throw out current contracts with workers if it’s unable to reach deals with them. The Transport Workers Union represents the mechanics and related workers, while the flight attendants and pilots are each represented by their own unions. Five other TWU groups have already reached deals with American.