Bike bag? Considering how I've seen bikes in hardshell boxes treated before they were even checked in by airlines .... bag? I'm sorry, I would not let my baby fly in a bag unless the bag covers a steel case
I'd get a real hard shell case (not a box) or borrow from my LBS or fly sans bike and rent at the destination.
I understand if you're a member of L.A.B. your bike may fly free, or get a case that "looks like luggage" and hope they don't notice .
Welcome to TE BTW.