So in the summer I'm going to one or two conventions with a cosplay however the thing is i'm flying by plane and one of them is in another country (Lithuania)

The cosplay I'm more concerned about is Luna as she'll be a mini quad (something similer to this http://fav.me/d4rc9h1 )

Is there anything I need to look up before flying (excluding weight restrictions) ect....

Any help would be great c: