There is another thread on this topic here that I cannot find via search that gets into more details, but CBP does follow state laws for alcohol; in fact the prohibition of alcohol in the constitution gives the states much power with regard to some aspects alcohol instead of the feds. IIRC it is not the arriving airport but the destination or home of record of the pax involved.

I have seen CBP report pax in Texas, as just one example, to make them pay state duty, and in Pennsylvania seen them admonish and confiscate a liquor item due to state laws.

https://help.cbp.gov/app/answers/det...RlXyp3bQ%3D%3D
This covers shipping importing but also applies at airports:
"Please be aware that State ABC laws govern how much alcohol a person may import into their state without a license and those laws are enforced by CBP. You must check with the state ABC board where your shipment will enter the country to determine their limits."

https://help.cbp.gov/app/answers/det...free-exemption
"Most States restrictions on the amount of alcohol that can be brought into that State apply only to residents of that State. Usually people transiting a state are not subject to those restrictions, but sometimes regulations change, and if this is a matter of utmost importance to you, you can check with the state Alcohol Beverage Control Board where you will be arriving to find out what their policies are.

There is no federal limit on the amount of alcohol a traveler may import into the U.S. for personal use, however, large quantities might raise the suspicion that the importation is for commercial purposes, and a CBP officer could require the importer to obtain an Alcohol and Tobacco Tax and Trade Bureau (TTB) import license (which is required for all commercial importations) before releasing it. A general rule of thumb is that 1 case of alcohol is a personal use quantity - although travelers are still subject to state restrictions which may allow less."