My 2 cents on why I think trip parking IS illegal: The parker never truly lost possession of the trip, just found a way to make it temporarily disappear from his line.

Let's say you were suing person X. X calls me and asks to sign some assets over to me until this lawsuit clears up, then give them all back. If the scheme were discovered, wouldn't the judge consider those assets to always have belonged to X?

I don't think ALPA is endorsing it, but they've been told it's going on and they're ignoring it. I told them several years ago, and they told me to bring them proof. Problem is that we as individuals can't track most of the transactions involved. ALPA can, they just ignore it.