From the TSA website:
If you purchased the alcohol overseas and have a connecting flight in the United States, the alcohol is allowed in your carry-on bag if;
The bottles are packed in a transparent, secure, tamper-evident bag by the retailer. Don’t try to sneak a swig! If the bag looks opened or tampered with, then it won’t be allowed to fly in your carry-on bag.
Keep the receipt! You must show that the alcohol was purchased within the last 48 hours.
https://www.tsa.gov/blog/2019/06/21/...veling-alcohol
