Section 68.50 - Purpose and applicability(a) This subpart contains requirements, in addition to those in part 67 of this chapter, for obtaining a coastwise endorsement for a U.S.-built vessel- (1) That is owned by a person that qualifies as a citizen under § 67.35(a) , § 67.36(a) , § 67.37 , or § 67.39(a) of this chapter; and(2) That is demise chartered to a coastwise qualified citizen under § 67.33 , § 67.35(c) , § 67.36(c) , § 67.37 , § 67.39(c) , or § 67.41 of this chapter.(b) This subpart applies to a vessel with a coastwise endorsement issued on or after August 9, 2004. It does not apply to a vessel under subpart D of this part.