It is not yet clear when operations with the F/A-18 fighter jets will resume.
An army spokesman told the Keystone-SDA news agency that it was not yet possible to say. Specialists are now being consulted to determine whether the problems with the oxygen supply affect individual aircraft or the entire fleet.
However, the fleet can still be used for air policing, the statement continued. This means that operational readiness remains guaranteed.
On Thursday, the Defense Group reported that pilots had noticed irregularities in the oxygen supply to F/A-18 fighter jets in recent days.
