The Vodka story has just brought a blinding realisation to me.
If I buy a bottle of spirits in T4 duty free on my way from LHR to COS (Colorado Springs) I go via ORD where I enter the US. When I check-in for my onbound flight I am going to have a problem if I troll up carrying my bottle of Glenfiddich in a BAA placcy bag .... and I don't think putting it into my hold baggage at O'Hare is an option.
Hmmmmm.