"Everett M. Greene" wrote in message ...
Newps writes:
Ron Garret wrote:


2. How many flight plans per day does the current system handle?

Millions.

Are you certain about that? It sounds high by several orders
of magnitude. Every airplane in the world would have to make
about a hundred flights per day to get to a million flight
plans per day.

Within the U.S., the number of IFR airborne aircraft at any moment
peaks up to between 4000 and 5000 on most days now.
Overnight minimums typically get down to around 1000 at a time.
http://flightaware.com/analysis/graphs/total.rvt
I won't try to extrapolate that to a total daily count, though.