411A - the Tradewind L1011s were parked because Interlease ran out of money - they were simply using TradeWind's AOC. Not sure what they are doing with the A300s, though!
As for who goes first in the event of retrenchments, I'd say that they would be from Mainline rather than AACS as AACS is a separate company, set up for specific tasks. Of course, if the downturn - or cancellation of the BA contract - hits AACS, the converse is that it wouldn't result in Mainline job losses.
Just my 2c worth, anyway.