However when top 40 KXDR signed on in 1999 KNSO would gradually move back to an AC format culminating with the addition of Delilah on Valentine's Day 2000.
KFBB-TV in Great Falls and KMSO-TV in Missoula (now KECI-TV) began sharing programs with KOOK and KXLF in 1958; the four stations formed the Skyline Network.