or eliminate airports
with a bit of air to air refuelling and parchutes, I reckon just quit landing and discharging passengers. Just drop off them off over the aerodrome via parachute, with their bags tied to them! Sure to cut down on how much stuff people drag around with them.
For "boarding" then try the USAF method of tieing a balloon to yourself and waiting for the plane with a pickup claw to pass overhead. terminal roofs are ideal for this scenario... again, it's all "carry on" so the natural tendency would be carry less. A380's would be interesting to watch! And any boozed up passengers will be stone cold sober by the time they get to their seat, guaranteed!
And for loco's there won't be seats, just stay hanging under the plane all the way to drop off. Shame if the Alps are in the way...
Just have one big aerodrome for the UK so planes can stop once a week for assorted maintenance... put it somewhere isolated like.. Scotland...
BAA could make a fortune putting houses on the no longer needed runway's across the South of England
S