Can I Pack Duty-Free Alcohol in my Carry-On?
As a general rule, yes, as long as you keep your items in the sealed plastic bag from Duty Free. Some countries (South Africa and Argentina included) will confiscate liquids over 3.4 ounces in secondary, at-gate security checks; duty-free items, however, should be exempt. Until recently, if you had a connecting flight in the European Union or the U.S., you would have to either stow your purchases in your checked bag as you switched planes or toss them. But the introduction of new liquid scanners in the EU and the relaxing of such rules in the States (thank you, TSA) mean that you can now carry these items on board.