This is my trip on Friday !!!! And - Colombia is 100% open. Then - on the way back - if you are out of Europe until the 15th day - you could return via USA (you need 14 full days out after the day of departure from Europe).

As for the *A feeders - it will be the fare of the TATL carrier that dictates this. The long-haul carriers often setup fares with feeder flights from all types of carriers - it makes pricing easier (and better) and gets more traffic on the long-haul - which is the goal. The short-haul carrier doing the feeder flight gets very little revenue . . so - - both sides have to agree on this for the fare to be setup. I did check the IB fares FRA-CTG and they do not provide for LH feeder traffic - so this must be either a hacker fare or some special combination.

My ticket (now to AUA via BOG) was originally ZRH-MIA-GCM with AA operating the GCM leg. That would be pretty typical that AA is taking inbound long-haul to get to GCM. However, on almost all other Caribbean routes, there are no AA segments allowed on the *A TATL fares.