Phillips 66 is shipping oil from Texas to an East Coast refiner, the first cargo of U.S. crude on that route since President Donald Trump waived a 100-year-old maritime law. 

The Bakken oil — a light-sweet grade from shale formations in North Dakota and Montana — was loaded in early April at a Phillips 66 terminal in Beaumont, Texas, onto the Malta-flagged Htm Warrior, according to ship-tracking data compiled by Kpler. It will be delivered to the Trainer refinery in Pennsylvania, owned by Delta Air Lines unit Monroe Energy.

The use of a foreign-flagged vessel to transport oil between U.S. ports is only possible because of a 60-day waiver Trump signed March 18, effectively exempting commodities from the Jones Act. The 1920 law requires that ships carrying goods between U.S. ports be American-built, -flagged, and -operated. The temporary waiver is aimed at boosting the supply of oil and fuels as the Iran war strains energy supplies.

No other foreign-flagged vessel has shipped U.S. crude from the Gulf Coast to the Atlantic Coast since Trump waived the Jones Act, according to Kpler data, but several cargoes of Middle Eastern oil have made the voyage on foreign-flagged ships.