If you island hop Scotland->Iceland->Newfoundland it's pretty easy to get across the Atlantic with pretty much any airliner. These will have no payload, but be filled to the brim with fuel. On most smaller airliners you can fill with max pax/luggage or fuel, but not max of both since that would put you above MTOW. So max ferry range "empty" is normally far greater than max range with payload.
As for Asia/Pac, you fly over the Atlantic the other way and hop on down via the Middle East and India. For the Tsunami relief effort, SK
-82s to Thailand with only 2 intermediate stops from CPH
The only real problem comes when you have to fly to Hawaii, and for that there are ferry tanks:
[Edited 2005-12-15 00:22:52]
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo