For U.S. Boeing 747-400 operators, going outside the country for heavy airframe maintenance may be the only choice, as North American MRO capacity for the huge aircraft becomes increasingly limited. It's easy to see why, given what has become a relatively small number of aircraft. According to Aviation Week data, as of May 1, 2012, 10 companies in North America operated 125 747s, including 93 747-400 models. Of those, 51 -400s were still in passenger service—mostly with United Airlines ...


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