E
EastUS
Guest
Can you say "Cactus"?
Cactus, Cactus, Cactus, Cactus, Cactus, Cactus, Cactus, Cactus .
It isn't "US Air", it IS "Cactus".
What does that suggest?
"What does that suggest?" Hmmm....perhaps the complete inability of all concerned to come up with any semblance of a respectable callsign that sounds like something other than a childish joke, or is even an actual obscenity in some foreign languages?