Anyways here's Propeller Arena
It was a Dreamcast game developed by AM2 (the same division that made Crazy Taxi) and it was made with Online in mind. It's a dogfighting game with a Pop Punk soundtrack with bands like Rise Against on the soundtrack
The game was 98% complete, the only thing that needed to be done was to ship it and turn the online servers on.
Sadly two things happened:
1) the September 11th Attacks (especially since one of the levels takes place in a New York type place)
2) Sega was discontinuing the Dreamcast and felt there was no need to waste resources on the online mode
Game went unreleased until 2004 when one of Sega's American employees leaked it.
You can easily find it online