Originally Posted by
airsurfer
Every service / product, so also transportation (bus / train / car fuel) is taxed, called GST, Sales Tax or whatever.
Why are air tickets exempt from sales tax ?
According to COP21 climate change plans, we should do everything to lower CO2 emissions and air travel is one of the larger ones. Now, oil prices are low, air tickets are cheaper than ever, this is a chance to tax air tickets, according to the principle 'the polluter pays'.
If you think airline tickets aren't taxed in the U.S. or Europe, look at this price breakdown for a hypothetic trip PHL to MAD with a change at LHR:
I believe the reason you don't see the tax added on at the time of purchase is because of laws in the U.S. requiring full disclosure of cost in ads.