Sam69,
MTOW of the C-17 is 585,000 lbs
The EOW is 276,000 lbs
Max Fuel 180,000 lbs
Fuel Burn 22,800 lbs/h
That would give us a max payload of 57 Tonnes to get across the Atlantic. Max Payload is 76 Tonnes (25% penalty) Yes AR is an option, but very expensive.
As for the restrictions, The...