100% correct Hooded..
A reduced fuel load out of LBA will assist the Boeing 777 in using LBA's short runway with a much heaver load so to get some cargo uplifted. Also the addition of the ATH stop should help put more pax on the larger aircraft to/from ISB..
I had heard that they have been wanting to open a ATH - ISB route for a while. But I don't know if they will be allowed to carry pax between LBA - ATH. I guess that would be down to if they have traffic rights or not?