Apparently I don't.
Please explain to me how the US airline industry, which has been deregulated since the Carter administration, received subsidies which cause it to lose billions of dollars whenever fuel prices rise. Also, please explain to me how airport subsidies would make cause airlines to bleed money when fuel prices rise.
The simplest and clearest explanation is that air travel is a hyper-competitive market, and when prices rise fewer people fly and since an airline's costs are relatively fixed, they start losing money hand over fist if they can't fill their airplanes.
I agree that there are some situations where price increases don't significantly change consumer behavior (economists refer to this as inelastic demand). One example is with salt, which is so cheap that even if you increased its price tenfold most consumers wouldn't change their behavior. Another is a monopoly service like old-style phone service, where the service is essential to live in a modern world and there aren't any alternatives -- although that was true in the short term that monopoly is one of the forces that created the world we live in today where there are a bewildering array of cell-phone providers all competing viciously on price.