CHINOOKER
"i" before "e" except after "c" makes it "inconceivable" and it should be "unveiled" not "unvailed" and did you mean "follow suit" not "suite"? Also FedEx cancelled their A380F order some time ago.
Other than that, a somewhat less-than-average posting! Try using Spellchecker.
Fuel savings gained by using B777-336s compared to the B747-436s may be offset by higher leasing costs and other operating costs, including maintenance and insurance.Add in the cost of converting crews from 747s to 777s and the savings may not be quite so considerable.