Bradford Plumer looks at The End Of Aviation, as envisioned by Anthony Perl and Richard Gilbert, two Canadian transportation experts, in their new book Transport Revolutions:
[They] envision a world in which rising oil prices have reduced domestic flying in the United States roughly 40 percent by 2025 — even assuming that airlines improve fuel efficiency by about 50 percent. In such a scenario, the United States could go from having nearly 400 primary airports down to 50 or so; instead of dozens of flights each day between New York and San Francisco carrying 200 people apiece, there might be only a handful carrying 800 or more in new extra-jumbo jets.