Per the WP:Disambig page, "If only a primary topic and one other topic require disambiguation, then disambiguation links are sufficient, and a disambiguation page is unnecessary." Since the radio station call letters are the primary identification and the ICAO code reference to an airport is a secondary identification, a hat note is sufficient and requires no more steps than would a disambiguation page for people seeking the airport. It's not about which subject is more famous, just that the radio station is primarily identified by this name while the airport is primarily identified by its full name with the ICAO code only a secondary reference to that airport. -