Based on what I could find on the Aegean Website, it appears that our AA Executive Platinum Status would really be of no benefit departing JTR (Santorini), but being on a Z Class Fare would allow us each two (2) 32-kg checked bags, effectively making our allaowance four (4) 70 lbs bags, which is sufficient. If this is correct, I really don't see why I would book this any other way than on one ticket via AA.com under one PNR. However, again, if I am missing something, please chime in!