I believe a good compromise between "U.S. Air" and "Cactus" call signs would be to use "U.S." The suggested call sign has a number of benefits such as:
- A new call sign for the new US Airways.
- The first and last two letters of the "U.S. Air" and "Cact U.S. call signs"
- Patriotism.
- Every piece of marketing literature, posters, and other ads have slogans such as, "Come fly with US", "Do business with US", "Vacation with US", "Charge with US", etc.
Finally, I believe the "U.S." call sign would be something different, it would not have either pilot group disappointed, and it would help assist the culture integration.
Regards,
USA320Pilot