There are cases of Customs limiting the amount of alcohol a passenger could bring in to the amount allowed in the arrival state, which was less than federal law allows. I read about that because there was a major complaint due to the flight being diverted (the intended destination allowed a larger quantity than the diverted-to state did).

But that was many years ago.

See https://help.cbp.gov/app/answers/det...r-personal-use for the official statement of policy, including "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,"