I think what he's getting at here WRT segregated vs SRO is that there is less "dead time" on a SRO than there is with a segregated operation. If every aircraft was a 737 then all would be great but there are "heavies" which eventually need a wasted gap behind them which can be "filled" with and arrival in SRO.
<opens old can of worms>
Dual mixed mode ops at LHR anyone. 55/hour both sides?
