Aces High 2
This is the best version for LAN play, and it was the last version supporting the old "Head-to-Head" combat. Support for offline missions was fairly new when this version was released, but it does support the vast majority of the offline missions that have ever been written (especially if they are recompiled from the original source code using a corresponding, old version of the Mission Editor). Computer-generated aircraft fly very good combat in this version. The greatest thing about this version is that it is possible to fly offline missions on a LAN, so several human players can team up against computer-controlled drones.