I agree AOG - it seems like a good idea.
But I also agree with Ratter - the logistics are horrendous.
For the past six years, I have travelled to Montreal, and been routed through Philadelphia.
Even though I am only transiting, and not physically leaving the airport, I still have to go through Imigtarion Control which involves fingerprinting and retina scanning.
I have no objection to security measures, but on two occasions, I missed my connecting flight because of the hour-plus delay it took to clear the process.
The first time, I queried what would happen to my luggage, and was assured that it would be taken off my planned flight and put onto my new flight, quote 'No bag ever travels without a passenger linked to it.'
When I arrived at Montreal, I was advised that my bag had been missed, and was travelling on the next flight, which made something of a mockery of the system I feel.
I was awoken from my deep sleep in my hotel at some unearthly hour of the morning to advise me that my bag had arrived - obviously it had endured the delay and exhaustion better than I did - even if it did flout the security rules by being flown and couriered unaccompanied!