Game 35430 (look)
Last turn I flew 2 heroes (Ranger/Assassin) on a Ghost to join up with 2 Yeti that were on Galleons.
This turn it now appears that the entire stack is flying! I can click anywhere and the move path generator takes a direct path from the water to the land without making the 2 Yeti change from boats at a port. Ungrouping and regrouping doesn't make any difference. I didn't test whether I could actually move the stack in this manner until you had a look.
KGB