Avination is a separate grid, in other words, it's not part of Second Life. Many avination sims have CCS enabled
Your Second Life av will not transfer across to Avination, but your exisitng CCS character sheet can be used in Aviation. In other words you can use the same CCS sheet on both grids. Your new Avination av can have the same name as your SL av, and if you are a level 35 Death Dealer in SL, then you will be in Avination too.
The downside is that you will need to get yourself new clothes, weapons and hair.
For more information see the Avination website at http://www.avination.net/