The title says it all. When flying international, for some reason there is only duty free stores after going through passport control before taking off, and never any stores before going through passport control after landing. Why is that?
closed as unclear what you're asking by Giorgio, Ali Awan, David Richerby, Michael, Itai Aug 16 '17 at 22:46
Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
Because you don't land at the right airports.
Several British airports have Duty Free on arrival, certainly Heathrow from my personal experience and I believe Manchester. I've heard of others.
There is a legal issue there. Duty free shops are usually allowed to not charge duty on the assumption that the purchases will be exported. It's one reason the sellers ask to see your boarding card, to check you are on an international flight. An arrivals duty free needs to be explicitly enabled by legislation exempting them from taxes on sales to arrivals. Not all countries may be willing to pass that legislation.
Arriving in Oslo and Reykjavik, there is duty free (mostly alcohol) to purchase on arrival before entering customs.
Arriving in Buenos Aires, there is duty free on arrival (mostly foreign electronic goods) before entering customs.
(As has been stated) Heathrow Terminal 5 has a small duty free collection of alcohol and perfume on arrival.