i have never understood why the FAA has not adopted the EU system of callsign modification, e.g. SWA1328 could have used the callsign SWA132H and SWA3828 could have used the callsign SWA382J. Risk reduced. I loved the callsign mod when I flew contract in Europe.
Used to, but I think it was an idea from the airline's safety dept, not The Friendly Aviation Agency.
Back in the 60s/70s when Air West was flying, every AW call sign ended in "Red" to avoid confusion with Western Airlines flights. It would have been "Western thirteen twenty eight" and "Air West thirty eight twenty eight Red."