Let's not forget the explosion of the Asian low cost carriers.
It seems I see a new one every time I go flying around the region.
There are only so many airports and runways you can build around a major Asian city.
Yet the authorities seem perfectly happy allowing dozens of new carriers adding hundreds of new routes and frequencies to these congested airports with 320s and 737s...
At the end of the day, a 737 carrying 150 pax will clog up an airport just the same as an A380 carrying 500.
LCCs are all good and fun, but at the end of the day, authorities and airports are going to have to recognize the toll they are taking on the ground facilities and airways structure, and start to treat them adequately.
Stop charging carriers by pax or aircraft weight, and start charging them by runway and airway occupancy time... that would be a start.