Anyone passing through Darwin Airport should make sure you look out the window toward the south-eastern end of the runway. If you get lucky you will see one of the U.S. Marines V-22 that rotate through Darwin on a regular basis. Watching one of these frightening contraptions taxi and transition to flight will disabuse any rational observer of the idea that anything like that is going to be a realistic option for public transport any time soon. How Bell and Boeing have got them to work at all is miraculous.