Hello,
Not sure how long it is going on but this morning it got my attention.
some US Airways flights on SBS-1 were transmitting a AWExxx as Mode-s callsign.
Not long thereafter "Cactus xxx" requested oceanic clearance on 123.950
Both AWE and Cactus are related to America West which I believed merged recently with US Airways.
Appearently they adopted Cactus as their new Callsign.
I thought it might be handy to know.
Grtz
Joost