Joe, the DaKine bag is classified the same as a Sporttube by the airlines. It's a ski bag. Bob M and TK brought their models to SA in them.
Bob built himself a gorgeous and lighweight wood box that fit perfectly inside it. He flew Icon 2's and an Explorer. The I2 has a 72" center panel. I think he brought 3 of them.
Tom had a rather ghetto coroplast and tape job that was just as functional...