In my answer to this question, I describe how calculated takeoff times (CTOT) are used as a tool in European air traffic flow management to prevent overload and maximize capacity. I expect the ATFM system used in the USA to be quite similar, but I'm sure there are technical differences. I am hoping someone can provide a similar answer, detailing ATFM procedures in the USA.
Air traffic flow management (ATFM) is a service established with the objective of contributing to a safe, orderly and expeditious flow of air traffic by ensuring that ATC capacity is utilized to the maximum extent possible and that the traffic volume is compatible with the capacities declared by the appropriate ATS authority.
In Europe, air traffic flow and capacity management (ATFCM - notice the additional C) is handled by EUROCONTROL.
Each air navigation service provider (ANSP) is responsible for declaring the capacity of their ATC sectors in terms of a maximum number of movements that can be safely handled in given time intervals.
All IFR flightplans in Europe are processed centrally by the Integrated Initial Flight Plan Processing System (IFPS). If, based on the flightplans, it is calculated that capacity within a sector will be exceeded, flights might be rerouted or level capped, or they receive ground delay (a slot time).
This system works very well, and ensures an efficient and safe flow of air traffic within Europe. However, flights originating outside of Europe cannot be processed in the same way. For example, flights departing outside of Europe will not receive any slot times, which makes the system inflexible, since these flights still have to be taken into consideration, but cannot be adjusted the same way other flights can.
This has made me wonder, why is it not possible to simply link the European system with similar systems around the world, to create a global ATFM network? Specifically, I am interested in how ATFM works in the USA. I would like to identify the main differences between the European system and the system in the USA, with the goal of understanding what prevents these systems from working together.