Charter money or freight or passage payments received by a nonresident owner or lessee, with respect to a vessel which is operated exclusively between ports of New York State and foreign ports or ports of other states, does not constitute income derived from or connected with New York State sources if the individual receiving the income maintains no regular agency in New York State and is not carrying on business in New York State, as determined under sections 132.13 and 132.14 of this Part.
N.Y. Comp. Codes R. & Regs. Tit. 20 § 132.23