I shipped a non-split rack home one year from Illiamna, AK. It was borderline book. I paid an up charge ($90) to Alaska Airlines to have it shipped whole, as part of my checked baggage. The skull had to be clean and covered and all the points had to be covered. I used cardboard and duct tape. All went well until I had to transfer to a smaller plane for the last leg of the trip. It wouldn't fit in the cargo hold, so some bozo just crushed the two halves together so it would fit.
Luckily I wrote down all the width measurements when it was whole, so it was easy to mount back to original. It would not have made the book anyway, I found out later.
If it's not a book animal, just split it (after taking some photos and recording width).
I'm just guessing but I think my rack weighs about 10 lbs.
Eel