This is the Grumman F7F Tigercat addon for the game FlightGear
The Grumman F7F Tigercat was the first twin-engined fighter aircraft to enter service with the United States Navy. Designed for the new Midway-class aircraft carriers, the aircraft were too large to operate from earlier decks.
To install this aircraft, download the .zip archive to your local hard drive, and extract them into your Aircraft folder. For windows users, this will be located in C:\Program Files\FlightGear\data\Aircraft.