I think HT was talking about the Warbirds flight engine which he also made. That’s the engine that FlyBoys uses. Also, that IGN article is a joke. I’ve played every one of those games and the writer left out some games that put half of the ones on the list to shame. Secret Weapons of the Luftwaffe, Aces of The Pacific, Aces Over Europe, and Janes WWII Fighters. Maybe they are counting Red Baron as part of the Aces franchise so they don’t include them...but let us not forget who single handedly revived the flight sim Genre...Lucas Arts. They made Sims FUN (BattleHawks 1942, Battle of Britain, and I mentioned SWOTL) and there’s NO mention anywhere. I assume the article left out Warbirds, AirWarrior , and Aces High because they are all massive multiplayer.