The Air Force has announced the end its 11-day grounding of F-35 aircraft at Luke Air Force Base, following problems discovered with the plane’s oxygen system.

Flying operations the aircraft will resume Wednesday, the Air Force announced, adding it has found no specific cause for the oxygen problems that had occurred during flights in May and early June. The grounding affected only the F-35s based at Luke, and had no effect on the Navy or Marine Corps variants of the aircraft.