TMOliver writes:

Currently, radar ATC is structured so that all a/c follow charted
"corridors" enroute to destinations. It is assumed that a GPS-based system
will allow direct flight paths, saving substantial time and distance.
Because of the possibility of inoperative GPS systems in individual a/c, the
radar system will have to remain in place and be maintained.

What provision is made for failing GPS systems aboard aircraft? One aircraft
misreporting its position could cause serious trouble for an entire region.
One aircraft or transmitter deliberately sending out false information could
be a terrorist's dream.

Your compehension of reality is pretty limited, then. There are plenty of
runways and no real overload of a/c. The problem occurs with too many
flights coming and going from the same destinations at peak times.

And why isn't that correlated with the number of available runways? Twice the
runways means roughly twice the capacity.

A 737 with 150 aboard is several magnitues chaper to operate that 1 747 with
300+.

Several orders of magnitude? Meaning _at least_ 100 times cheaper? What are
the exact costs, and where did you find them?

Airlines chose equipment and flight schedules to attempt to meet
customer demand. Obviously, any improved system based on hub/spoke
operations, the "norm" for US domestic service, will likely mean longer
layovers as flight "blocks" are speced to reduce crowding. Smaller a/c are
however here to stay and are the mainstay of furure planning by airlines.

That's just what they said about 747s.

"Jumbos" are suitable only for limited routes requiring consistent passenger
levels and types of service.

There suitable for all sorts of service, if you don't need a departure every
15 minutes.

Woulkd you care to describe those.....

Flying many small planes instead of fewer large ones. I look forward to your
details on operating costs.