They fit into 2 suitcases acceptable to airlines that I am aware of, one Carlton and one Samsonite. The Carlton cost over $100 and this after European VAT refund (Samsonite $220 at BF, merely to illustrate how inflated your claims are). It takes iterations to distribute the bike properly
Ok, I re-read your message - this is absolutely wrong. There are hundreds of suitcases out there in rectangular form that approach max checkable dimensions; the NWT will fit into any of these. Originally it was shipped with the old Samsonite oyster shell case, which has many copies. Now it's shipped with the Flite 31, which also has many copies. And there are many other types of suitcases from many manufacturers.