canadiantraveller wrote:Yes this is a pretty common thing. If you have a connection where you will need to recheck through security on your connection, you are going to lose it. However if you have a connection where you won´t need to reenter security, you should be fine.
My last trip I connected through El Salvador, flying with Taca airlines. When you arrive, you get off the plane, but stay in the same waiting area, but don´t have to go through security again, in this case your duty free is fine.
This might the the case for transfers in NON European airports, but in European airports even if you are in the transit/security area, you are not allowed to board a plane with sealed Duty free bag from a Non-European / US Country.