“You’d think those bars would have an over-serving policy.”
Some countries do, about a dozen of them. And there are other countries that have something like the six drink rule. But there are ways to get around it. And remember, dram shop is dedicated to recognizing the point of reaching intoxication.
Travelers can, also, buy alcohol at airport duty-free stores, primarily when departing for international destinations. These stores offer tax-free spirits, wine, and liquor. While you can carry duty-free alcohol through security, it must be in sealed, security-tagged bags, often purchased within 48 hours of flight. But they are unsealable in the aircraft just like at home. And very easy to access from the overhead. And they are not supposed to open up the booze on the aircraft. But when did that stop people from doing what they are not supposed to do? These are the same type of people that have tried to bring things on the aircraft like a leaf blower.
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Gasoline-powered leaf blower?