It's been so long since I logged on to an AIX box I wasted 5 mins having a search. There was an x86 build back at version 2.0 it would seem, but this was more of a test release than a general release and never got followed up. There was an Itanium build (please see the sticky if you don't know about Itanium) back at 5L in ~2001. Strangely they never bothered doing it again!
As for the licence, I believe it's worse than that. Even if you had the HW and a disk to install on it you would still need to speak with the nice man at IBM and pay him money. There are a few places on-line that will sell you old workstations with a licence but unless you REALLY needed AIX I'd say your better to find a solution using cross platform tools.