I recently as Japan, got my hands on Noumea and have begun prepping it as a major airbase. I've moved in a few squadrons of various types but have not been able to get any fuel there yet, it is at 0. I've owned it for 3 turns and for the past 2 I've randomly set my planes on Naval Attack and low and behold they're flying their missions!! Where are they getting their fuel??
Aviation fuel is treated as supplies. Fuel, per se, is just for ships.
Edit: Khyberbill beat me to it.
In theory, there is no difference between theory and practice, but in practice, there is. - Manfred Eigen