In a perfect world, iHeart wouldn't be struggling with billions of dollars of debt. But since they are, this little fantasy scenario of mine would seem like so much of Nero's fiddling while Rome burns: 1. iHeart parks KXNO calls onto one of their many FMs. 2. KXNO 1460 Des Moines applies to retrieve heritage KSO calls. 3. KKDM 107.5 Des Moines, "KISS 107.5" applies for KSO-FM. 4. KXNO calls are moved back to 1460.
Apologies if I've posted this scenario before (I'm pretty sure I have) but since we're on the topic....
BTW, all of the Seattle stations that are using K+the heritage three-toe on the facilities that originally sported the three-toe would likely be able to get the three-toe back if they were to ask. Again, most managements likely have bigger fish to fry, or keep from burning, as in the analogy above.
The administrative rule is that a 3-letter call can only be retrieved if the station is currently in the hands of the same owner as the one who changed away from the three letter call. If the station has been transferred since the change, they can not get the three letter call back.