While the Pentagon now expects the plane to fly until 2088, GAO found the services are planning to slash flight hours, which can help hold down the program's topline.
Something to do with being unable to make the fuel tanks inert. If you Google it there's quite a lot about it. I'm no expert so I can't tell you what that really means
https://www.forbes.com/sites/erictegler/2022/11/23/air-force-f-35-lightning-iis-still-cant-fly-within-25-miles-of-lightning/?sh=7659da1e663e dated 2022, but covers the issue in detail.
deleted by creator
Something to do with being unable to make the fuel tanks inert. If you Google it there's quite a lot about it. I'm no expert so I can't tell you what that really means
deleted by creator
https://www.forbes.com/sites/erictegler/2022/11/23/air-force-f-35-lightning-iis-still-cant-fly-within-25-miles-of-lightning/?sh=7659da1e663e dated 2022, but covers the issue in detail.