("Steven P. McNicoll" wrote)
[snip]
As more Centers were established in the following years more airways
became controlled.


How did they plot all of those planes' positions? Pilot reports or their own
triangulations?

With no radar, what were the controllers doing in the late 30's, waiting for
pilots to call in and tell Center where they thought they were?

Curious how things worked before radar?


Montblack