am thinking they might let you do it, if you remove the top bar and keep it really flat by not having much in it.
but I always just put mine in a duffel bag and check as luggage when I was flying commercially to hunt alot, course most of that occurred pre 9-11
I just used a day pack for my spotting scope, rangefinder, binocs and sat phone
figured it was just under 4K worth of stuff in there.