Hmmm solution to the KFS air force...... a tiny force of Korean war era jets..... Say F-86 Sabre jets....... salvaged from from a Air Force museum, memorial display, collectors, private air fields... 3-4 capable of flying and 2-6 that sit on the ground and train ground crews / maintainers.
This could meet the KFS P-47s in the air and whip them... enough to control the air over the Jackson Republic with ground radar and ground controllers to vector onto a target. Not enough for an expansionist campaign.
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