MEMPHIS, USA — FedEx Corp. is propping up the value of used Boeing Co. 757 jets by buying the twin-engine planes to replace some of its oldest, least-efficient freighters. The operator of the world’s largest cargo airline will add 18 more 757s by May 2012 to the 48 it has now. FedEx probably pays about $10 million each, a couple of million dollars more than an owner might get in a sale to a pas …
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