Oil exports are booming from the U.S. Gulf Coast thanks to the Middle East supply disruption caused by the Iran war.

Tanker transits Tuesday were 90% below traffic before the U.S. and Israel attacked Iran, according to shipping data.

A cryptic remark from Donald Trump has now been clarified. What he earlier described as a “very big present” from Iran has sparked curiosity and confusion. Now, the president says it involved oil ...