As a Customer I find the comments here a bit off putting yet interesting.
When I go to the airport, I look at the livery and if it says "US Airways" or "US Airways Express" I honestly don't give a fat rat's arse that Republic operates the plane. It says "US" on the side and legally that's who my contract is with, "US Airways Group, Inc."
So when I hear "Wasn't us it was PSA" it comes off nit picky as truth is if something bad happens the attorney will sue US Airways Group, US Airways Express and Republic and possibly PSA and/or whomever did the ground support. I do get your point but to date I've seen nothing as to the reason for the smoke?