"GLENDALE, Ariz. (AP) — Luke Air Force Base will resume flights of F-35 fighter jets Wednesday after experts and engineers investigated a series of events in which pilots reported symptoms of oxygen deprivation. Officials with the 56th Fighter Wing at Luke said Monday that
no specific root cause for the events was identified but specific concerns were eliminated as possible causes including maintenance and aircrew flight equipment procedures...."
https://www.usnews.com/news/best-sta...-investigation