Microsoft Flight Simulator X: Acceleration is a 2007 expansion pack for the 2006 flight simulation video game Microsoft Flight Simulator X developed by Aces Game Studio and published by Microsoft Game Studios for Windows. Acceleration introduces new features to Flight Simulator X including 30 new single-player and 19 multiplayer missions three new aircraft: the F/A-18A Hornet EH-101 helicopter and the P-51D Mustang and new scenery enhancements for sites including Berlin Istanbul Cape Canaveral and the Edwards Air Force Base.