Domestic Commerce Improvement Act

[AI summary unavailable — showing source text] Domestic Commerce Improvement Act - Amends the Merchant Marine Act, 1920 to prohibit vessels which are entitled to engage in coastwise trade and subsequently have major work done (currently, are rebuilt) from engaging in coastwise trade unless all the major work is effected within the United States. Amends Federal law to condition a fishery license or registry on all major work (currently, any rebuilding) having been done in the United States. Conditions a fishery license to engage in fishing near Guam, American Samoa, and the Northern Mariana Islands on all major work (currently, building or rebuilding) having been done in the United States. Allows, notwithstanding other specified Acts, a coastwise endorsement for a vessel that meets certain requirements, including that it be owned by a corporation qualifying as a citizen of the United States. Limits the activities of a vessel documented under these provisions, or chartered to a corporation eligible to document a vessel under these provisions. Amends the Shipping Act, 1916 to apply provisions prohibiting the transfer of a vessel to a non-U.S. citizen to vessels documented under provisions of this Act, but excludes from that applic…