I would think that the FA's with the most favorable feedback either internally or from AS customers would get first shot at inagural flights.
I had some great service from FA's on the 737-900's when they first rolled them out. I thought it was due to the most senior and therefore most experienced FA's for those routes getting those flts. Warmed nuts in a wine glass? How often does that happen?
Carfield, I too would suggest you write a letter of complaint. Just because it was an inagural flight doesn't mean one should with hold complaints.