Duty-free liquor is excluded from TSA's 100ml rule...
https://www.tsa.gov/travel/security-...g/liquids-ruleInbound International Flights
You may carry duty free liquids in secure, tamper–evident bags, more than 3.4 oz or 100 ml in your carry-on bag if:
- The duty free liquids were purchased internationally and you are traveling to the United States with a connecting flight.
- The liquids are packed in a transparent, secure, tamper-evident bag by the retailer and do not show signs of tampering when presented to TSA for screening.
- The original receipt for the liquids is present and the purchase was made within 48 hours.
The items inside the secure, tamper-evident bags must be screened and cleared. Any item that alarms or is unable to be screened will not be permitted in your carry-on bag. We recommend packing all liquids, gels, and aerosols that are over 3.4 oz or 100 ml in your checked baggage, even if they are in a secure, tamper-evident bag.