11 is certainly up at the higher end of the scale!
Moorabbin gets that many occasionally but across contra circuits. I've seen 10 on final across the two runways at Moorabbin but the only time I've see more in the circuit at once was at Narromine for Natfly.
I'd say Oshkosh or similar would get busier but that would be better as they would either all be coming or going versus doing circuits.
There should be a line drawn in theory somewhere, but hard to know where exactly.
Last edited by VH-XXX; 11th Jul 2013 at 12:31.