I know we laugh about this but, I believe that a pilotless CARGO aircraft is a real possibility. Afterall there are plenty of routes across the poles, for example, where the consequences of a hull loss are minimised. A few extra track miles to ensure that the aircraft does not fly over populated areas will cost a lot less than two pilots. I reckon within a few years we will have this technology. I don't see a pax pilotless aircraft as being a viable proposition until the technology has been proven which of course it will eventually be. I just hope that does not happen until after I retire!