What bike is best for plane and bus? That is a lot to think about.
First thing is replaceable parts. What parts are available in every village? 26 x 135 mm hubs, and cantilever brakes.
Next, the plane. S&S works best there. The costof the couplers + the case $1,000, about. What is the extra cost of flying the folding bike? How many flights does it take to save money over the folder?