[germainebull]

Suppose I want to determine the number of airborne aircraft over a specific airspace at a specific time, how would I go about this?

Is such method free to use?

If not, how much would I pay for the method?

How often?

To whom?

[germainebull]

I'm surprised that no one has yet responded to my query.
Where are those informed/curious FCers?

[earthsalt]

I remember seeing a TV station displaying the (live) number of aircraft in a particular space.
I don't know how they did this.
I'd also like to know.

[germainebull]

I still look forward to your responses.
That is, after you come back from your sabbatical leave.

[haripriyavkl]

I would like to answer your question but can you please elaborate the question so that it will be easy for me to research and find a solution. Thanks. I would also like to know that is why I am asking you.

[chikitta]

Maybe you should have some a course in aeronautics these are people who deal with air spaces and when they are in the control room that can see what is happening in the airspace