The dominant gateways on the U.S.-Canadian and U.S.-Mexican borders serve as both passenger and freight crossing points. The border ports of Detroit, Michigan, and Buffalo, New York, were the busiest land gateways for travel in personal vehicles by Canadians and Americans and also the leading U.S.-Canadian gateways for trade by all surface modes. On the U.S.-Mexican border, the dominant freight gateways, Laredo and El Paso, Texas, were also among the leading gateways for passenger crossings. In addition, the San Ysidro and Otay Mesa, California, crossings were major gateways for personal-use vehicles and trucks, respectively. The busiest city pairs for air travel were New York-Toronto for the northern border and Los Angeles-Mexico City for the southern border.