I did some looking around but didn't find any hard shell cases for a folding bike. Have you looked into Tern its a semi ridged case. Or they have a flight suit that protects the bike and you can pack in a standard size suit case. Also I reached out to A2B to see what they recommend as far as hard shell cases.
@Kristi, Due to the laws governing transporting Lithium batteries, you can't ship the bike and the battery on a passenger flight at this time. The battery would need to be removed and shipped ground freight, unfortunately.
http://gocycle.com/product/#accessories
This is a different folder...I think the travel case at the end of the vid is an example of what you are after. Don't know if your A2B would fit???
Watch the 'How to disassemble' at the end it shows the case.