I run a rental shop, so shipping them around is not a problem. I can pack up a 500mm f4 and have it on its way in 10 minutes flat. Unfortunately, that costs as much as $50 depending on where it's going. I would rather avoid the hit when traveling myself in the same direction.
I am heading on a vacation soon and need to take one of these babies on a plane with me. Obviously this does not go into checked baggage. Trusting something worth as much as a Honda Civic to the airlines is not my idea of a worry free flight. God knows what will happen to it there.
Does anyone have any experience going through security, or even carrying something on a plane the size of a 400mm f2.8 inside its hardcase?