Well we know that MilGov has operating refineries - there are mentions of them in Oklahoma and Illinois as well in Howling Wilderness - also the fact that much of what oil is being refined is being used to make lubricants - which leads to an obvious conclusion that they have refineries in operation.
As for spare parts and operational aircraft - we know that there are planes still flying in Iran and Saudi Arabia and from what Frank Frey has said in Kenya as well - meaning there are enough spare parts in those far flung areas to keep planes in the air (not a lot but enough)
given we are talking about CONUS spare parts to keep some planes going is not going to be a big issue or techs who know how to keep planes going - its more a question of how much jet fuel they are still producing and what would they consider a good reason to use those planes
remember we aren't talking huge forces of planes here - its probably more like small squadrons (about the size of what is flying in Iran) most likely based in places like Colorado Springs, Sacramento, Oklahoma, etc.. - meaning Air Forces whose whole complement could be a couple or three dozen or so planes of mixed types covering a wide area (again look at what the US still has flying in the RDF for a guide) based near where the fuel is either being manufactured or near where there are semi-reliable guarded transport networks to get it there - which in this case would probably be the OK to CO area that MilGov is guarding, down the Mississippi from Cairo to Memphis, or from the Bakersfield oil fields and refineries to Sacramento
there is still fuel being made even now - but remember that same jet fuel can also be used for tanks and other military vehicles as well - and there isn't a big air threat right now to make them direct that fuel from ground forces
In my campaign world after MilGov got the refinery going down in Texas again and they started making all that avgas they sent aerial tankers to get fuel to their other bases and also rebased planes into the area - again its where the fuel is
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