Slightly OT:<p>What is stopping the development of unmanned cargo aircraft?<p>If SpaceX can deliver cargo autonomously to the space station, I somehow fail to believe that flying an unmanned 747 from one airstrip to another is exceedingly complex.<p>To be clear, I mean that the aircraft is autonomous, not that it is flown by a remote pilot.<p>Once these systems are shown to be safer than human flown cargo planes, they technology will be widespread. After a decade of implementation, it can then spread to passenger transport as the ultimate auto-pilot. The pilot then just becomes the flight director, and takes over in case there are any failures.<p>Sadly, I'm sure the Burj high stack of regulatory documents prevent even experimentation in this field, let alone commercial implementation.