Next Gen
Some of the threads suggest the US is going away from the current airspace classifications. I have spent a lot of time in US airspace and Next Gen is not changing the alphabet airspace. Next Gen is slow in coming and a work in progress but it is mostly about moving away from ground based surveillance and navigation systems and moving toward Satellite based navigation and new technology innovations to relieve air traffic bottlenecks. The idea that that the Aus NAS should not be progressed because Next Gen has changed everything is not true.