Crimson Skies: High Road to Revenge Modding any% WR
It's also the Hollywood Militia Firebrand, not the DLC, even cooler considering AI ships almost completely work. It kind of reminds me of Starfighter, where all NPC craft are considered less set up player craft. You can play as pretty much any craft, including Fury, ambient NPC planes, and even Multiplayer-exclusive planes. Filesystem is made up of proprietary files that will need tools, but I can do very simple things. I've even found that the game can read from loose files, however it's prone to disc read errors if you unpack more than data.zip and planes.zip, which extracts pretty much everything you'd ever need to modify in the first place.