The general rules relating to applications contained in §§ 1.742 through 1.748 apply to all applications filed by carriers except those filed by public correspondence radio stations pursuant to parts 80, 87, and 101 of this chapter, and those filed by common carriers pursuant to part 25 of this chapter. Parts 21 and 101 of this chapter contain general rules applicable to applications filed pursuant to these parts. For general rules applicable to applications filed pursuant to parts 80 and 87 of this chapter, see such parts and subpart F of this part. For rules applicable to applications filed pursuant to part 25, see said part.