Public reports indicate the US Air Force has grounded its F-22 Raptors again — after a pilot reported an oxygen problem, again.  In this case, it appears to be a single-unit “pause” at Langley AFB, as opposed to a fleet-wide grounding.

Air Force officials are meeting on Friday to determine whether it is necessary to extend the grounding to the rest of the F-22 fleet. The pilot experienced what is known as “hypoxia,” and had to return to base.

The Raptors were previously grounded for months, though no specific cause was found for the reported oxygen issue.