My understanding is that if you book an AA award flight, or really any AAdv award, and you have insufficient miles in the AAdv account, you can transfer your Aviator balance to AAdv. But it must be for an established reservation. The whole balance will transfer, but I did not understand it would close the Aviator account. There is even a procedure where you dont have to transfer the full balance, so this would not necessarily be true.
But you must have an AAdvantage account that has had activity posted to it, must have an award reservation, and must have insufficient AAdv miles to cover the award.
This is somewhat similar to AA previous agreement with USAir, but you dont have to claim special awards as you do when using USAir miles.
[This message has been edited by Island (edited 05-11-2001).]