I Agree with CargoRat2. Apparently the 747-400 will remain in production and continue to undergo product developement. The 744ER is still a go at 910K pounds, 777 interior, LCD displays, new vertical profile display, new interior space utilization (above the main deck behind the hump), etc.
I understood as CargoRat2 did, that the main interest being shown in the 747X was the new standard length freighter, because of its enhanced range. With this change the 744 will remain the best freighter out there.
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Safe flying to you...