You reduce your travel, presumably for the purpose of reducing jet fuel usage. A few things can happen. 1) Someone else buys the plane ticket anyway, due to av

You reduce your travel, presumably for the purpose of reducing jet fuel usage. A few things can happen. 1) Someone else buys the plane ticket anyway, due to availability or reduced ticket price, jet fuel usage remains the same. 2) The plane ride got cancelled due to low number of passengers, replaced with another plane ride, total fuel used by airline remains the same. 3) Jet fuel gets cheaper or more available, so the fuel you thought you saved gets bought for another use, total fuel use remains the same.