I'm looking into a flight that arrives into ATH on Delta from JFK and connects to Aegean to go on to LCA. Do we have to go through passport control and/or reclaim our bags in Athens? What's the minimum connection time recommended? If we happen to get through faster than expected will Aegean allow you to change to earlier flight to LCA (there will be 3 passengers 1 adult and 2 children)? The ticket can be booked with the DL and Aegean flight on one Delta ticket or as two separate fares on one PNR or two PNRs for less money if bags have to be reclaimed in ATH anyway. Thanks!