"Matt Whiting" wrote in message
...

No, I meant give the takeoff clearance a little sooner while the aircraft
that just landed is still going down the runway heading for the taxiway.
This would have the same advantage as P&H in most circumstances.


That has the disadvantage of not ensuring runway separation.



Yes, that works also, but then what is the point of P&H if not to get more
throughput per active runway?


The point of position and hold IS to get more throughput per active runway,
and it does. Withholding the landing clearance while an aircraft is in
position wouldn't change that. Right now, aircraft can be cleared to land
while a departing aircraft is in position on the runway. Obviously, some
action has to be taken before the arriving aircraft can land safely, the
controller expects to issue a takeoff clearance to the aircraft in position
before the arriving aircraft gets too close. But what if he doesn't for
some reason?