well if you want to use it for flying don't ever pack your skis with your boots, always cary your boots on that way you will never be seperated from them, you can allways have the Airline rent you skis but you will never be able to rent a pair of boots that fit like your own.
And if you would like information on which boots you should buy ask these people:
if you can find them, corbets ski shop in Oakville Ontario had this boot bag from last year that u can strap your skis into + hold ur boots as an all in 1 thing. it was like $40 or somethin, works great and is comfortable.
Try givin them a call and see if they have them any more. (905)-845-1561