I agree that no new airport will be built in the UK, certainly not in the Thames Estuary, but otherwise you're wide of the mark. Aircraft will be using Jet A1 in 2020 and for a considerable time thereafter. Peak oil makes assumptions about likely new oil reserves. I remember sitting in a lecture in 1972 being told that oil production would peak in 1985 and run out by 1995..... In the same year The Club of Rome predicted a complete collapse of fuels and commodities by the year 2000. These things have not happened, nor will they. Human ingenuity is such that every crisis will be overcome - necessity is the mother of invention. Great strides are being made in fuel-efficient engines and in alternative fuels, so that some time in the future oil won't be used by jet airliners, but it will certainly be more than nine years before that happens. As for commercial airships, well they've been predicted for decades too......