You might also consider getting your hands on an electric bike box from a shop or a rental bike outfit. I got one free from a rental place that was happy I took it off their hands. I could slip my bike in largely assembled with racks and fenders. Reassembly was easy. Box was heavier duty than the bike box I purchased from one of those vendors. The e-bike box was larger but I checked it successfully on a domestic flight. One would want to check the airline policies.