Originally Posted by
Chronic Snoozer
Sounds overly complicated. Surely there is a simpler solution.
Removing downwind limitations is certainly an option that would have a large positive impact.
In reference to ground delays, you have to remember that the airlines have a 'seat at the table'. If there were say, a low probability of fog or storms, the airlines are consulted with a view to ground delay, however sometimes their own met people decide to accept the risk in running a "visuals" rate. They have to play the probabiltiies. Most of the time it will be fine and max capacity is achieved, however when this doesn't pan out, the s**t really hits the fan. The opposite is identical. Sometimes, when storms are predicted and a ground delay is created, the storms don't eventuate and you end up in 'max speed' situations you mentioned because ATC are able to run a high rate tactically because of good weather.
The whole concept is unbelievably dynamic. I can assure you that once you take off, ATC are always optimising for the lowest overall delay.