go to a hunting suply place they will have the mini heat pads that you put in your pockets to keep your hands warm they last 8-12 hours if i remember correctly.
now keep your mouth shout when it comes to the coach cause they don't want any animals on board.
I travelled a house gecko in the dead of winter I hade him in my inside pocket with 2 fresh pads every 6 hours and i checked on him every 2 hours that means alot of trips to the rest room hehe.
any way dont sweat it too much keep the snake warm and out of the public eye and it should go smouthly.
0.1 Jungle Carpet Pythons,