Aint This Found?
From The Lost Media Wiki
Internet Archive Link For A Bunch of Random XBLA Games, including Snoopy Flying Aces. https://archive.org/download/XBOX_360_XBLA/Snoopy%20Flying%20Ace.rar
Internet Archive Link For A Bunch of Random XBLA Games, including Snoopy Flying Aces. https://archive.org/download/XBOX_360_XBLA/Snoopy%20Flying%20Ace.rar