I felt that the FAA's proposed airspace redesign warranted it's own thread, basically the FAA is in the final stages period of their airspace redesign for the NY, NJ, PHL area which would more than anything else dramatically reduce delays at EWR, JFK, LGA and PHL which are four of the most delayed airports in the Country.
An example of how it would work is on page 28 of this presentation, it shows how currently there is only one departure heading off of EWR's runway 4R. The constraint of a single heading necessitates the increased separation of successively departing aircraft and impairs the ability of the tower controllers to efficiently move departures from the airport. The FAA's Integrated airspace alternative provides three departure headings from EWR's 4R thus increasing the departure rate.
There are similar changes for arrivals, it details the alternatives for EWR, JFK, LGA and PHL.
It's a great resource to understand the current congestion causes, and the possible mitigation the FAA's Airspace will provide these chronically delayed airports.
Here's an informative video: