[Kana]

Good 'Simulations' are:

IL-2 http://www.pacific-fighters.com/en/screenshots.php
Falcon 4 http://www.f4hq.com/default.php?page=default
Flight Simulator X http://www.microsoft.com/games/flightsimulatorx/
Combat Flight Simulator 3 http://www.microsoft.com/games/combatfs3/

There are a pletheroa of other 'arcade' like flight games. One I have, but havent' had time to play is Pacific Storm, it combines, RTS, strategy, and a flight sim all in one...

http://www.pacificstorm.net/gallery/

If I could find a up to date WW1 flight sim similar to Red Baron or Red Baron 2, I would buy and play it...