Iranian flights are being canceled in several countries amid an American pressure campaign over the Strait of Hormuz. The cancellations add to pressure on the Islamic Republic, which already faces a U.S. naval blockade and disruptions at its land borders. From Wednesday, foreign companies providing refueling and other services to Iranian airlines risk U.S. secondary sanctions, which can penalize non-U.S. firms for dealings with sanctioned entities. The United States alleges that Iranian commercial flights have helped transport weapons and fighters.