You are allowed to bring liquids, gels, aerosols and pastes as part of your hand luggage only within containers of up to 100 ml in volume. Any container larger in volume you will not be permitted to take on the plane with you as carry-on luggage, even if it’s only partially full.
All containers must be packed in a plastic transparent bag with a grooved closure or a zip closure, the volume of which cannot exceed one litre. This bag must be closed and handed in separately during the carry-on luggage security check. You are only allowed to bring one bag onto the plane.
You can find the rules for carrying liquids in your carry-on luggage on flights to the US on the official website of the US Transportation Security Administration (TSA)
Due to special security measures taken on the flight to New York, you may not bring onto the plane powder-based substances larger in volume than 350 ml that you bought at the airports, even if you packed them in security bags.
You should have finished your purchases in duty free shops at the airport up to 60 minutes before the flight. Safety bags in which you’ve packed your duty free items must not be opened before landing at your final destination.
You will be able to carry liquids with a volume greater than 100 ml which you’ve purchased in the duty free shops at the Nikola Tesla airport in Belgrade as hand luggage as long as the articles are packed in a transparent security bag.
If you are traveling to New York with a layover in Belgrade, having Belgrade as your final point of departure to the US, you will be able to take liquids of a volume greater than 100 ml which you’ve purchased at the duty free shop of the Nikola Tesla airport in Belgrade as carry-on luggage on the direct flight from Belgrade to New York as long as all the items have been packed in a transparent security bag and purchased in the last 48 hours. The receipt for these items needs to be available per request at the security checkpoint. You will not be permitted to take as carry-on luggage any item not available for show at the security checkpoint.
Special rules are applied to all flights to and from the US which you can find on the official website of the US Transportation Security Administration (TSA)