Along with earlier versions, 747 Freighters û over 250 in all û carry half the freighter air cargo in the world. The standard 747-400 Freighter can carry 124 tons (113,000 kg) of cargo up to 4,450 nautical miles (8,240 km). Only 747 Freighters have both a large side cargo door and a nose cargo door. This unique combination provides operators with the flexibility to carry outsized (extremely tall or long), higher-yield cargo, and shortens loading time for all shipments. The first 747 Freighter, the 747-200F, could easily carry 100 tons (90,000 kg) across the Atlantic Ocean or across the United States. Its operating costs were 35 percent less per ton-mile than the 707s that were configured as freighters. Boeing delivered 73 of the 747-200 Freighters between 1972 and 1991. In addition, more than 150 747s have been converted into freighters after serving many productive years as passenger planes. In addition, Boeing completed modifications to 19 existing 747-100s to Civil Reserve Air Fleet (CRAF) configurations in 1990. If called into service by the Air Force, the all-passenger commercial planes can be converted to cargo service in less than 48 hours. These 747s were used to carry troops, bulk and oversized cargo during Operation Desert Storm.