Originally Posted by
kale73
For ATC purposes you already have that to some degree. The regionals use the callsign of the operating carrier (For Delta Connection those are Endeavor, Brickyard and SkyWest).
How many flight numbers are wasted on codeshares?
Tons on codeshares. This is the main cause of lack of numbers. I wish everything was just booked as operating carrier code. I get the idea behind them, but they just cause aggravation to everyone. (Cant tell you how many passengers I've seen wait in line at DL to checkin for DL98XX to AMS)