could not handle more than 3 aeroplanes per hour
you must mean 3 aircraft in a sequence (on frequency). At 40 movements an hour thats an arrival pulse of 3 minutes interspersed by a departure every 3 minutes (90 secs between each runway movement) - probably looking at around a constant 6-8 in the Terminal area (30-35 miles) at any time with arrivals and departures.
3 aircraft an hour
