An application to change the facilities of a Class A TV station will not be accepted if it fails to protect authorized Class A stations in accordance with the requirements of § 74.793 (b) through (d) and § 74.793(g) of this chapter. This protection must be afforded to applications for changes in other authorized Class A stations filed prior to the date the Class A application is filed.
47 C.F.R. §73.6017