...{snip}...but to cater hot meals when not touching base at ATH or SKG will be much more problematic I imagine....{snip}...
The infrastructure to prepare hot meals for planes is available in all Greek cities A3/OA flies to; after all, Greece is not a third world country, independent of what many people think. Flights not originating in ATH or SKG but at other Greek airports do exist for several years (I used to fly HER-FRA and HER-AMS already in the 80s) and nobody arrived at his/her destination hungry: I don't know who invented cooking but certainly, we've been using fire for that purpose since several thousand years all over the country, even outside Athens and Thessaloniki.