Resar, if the companies won't put a little inflatable plastic thingie through which to see the instruments in case of smoke on board without it being demanded by law, they sur as hell won't modify a 747 for remote control, with all the issues of integrating it into the highly complex systems. Not even talking about weight... And the ground infrastructure needed - with transmitters of the steering signal and also operators, trained and ready within minutes to take over- it's an illusion.
And the military won't let civilians use their channels. The north atlantic is under constant surveiilance by NATO, but do we get radar service?
And, White Bird, if a train operates in 2 dimensions you must be talking about it moving along the tracks (1 dimension) and time (2nd dimension).
In this case, you should view the airplane to be operating in 4 dimensions (space's 3 dimensions + time). Time is a huge factor for flight, much more so than for trains or cars which will just stop if the factor time is exceeded. (Actually, so will aircraft, the stopping is just really hard to survive...)
Nic