Nobody really plays Aviation anymore. Sometimes people play nullo, which is kinda like Razz except the best hand is 12346 (lowest hand wins, straights & flushes not allowed). Most popular games are Omaha, Omaha hi-lo, Omaha 5, Omaha 5 hi-lo, Courchevel and Courchevel hi-lo.
There are several card rooms in Paris, I would recommend checking out the ACF and also Cercle Haussmann near the Opera. All you need is an ID, and there's a dress code (shirts, no snickers).
For more information about paris cardrooms you can also check out the Club Poker brick&mortar forum:
http://www.clubpoker.net/forum/viewforum.php?f=2
Good luck!