Popular carriers for October travel include Delta (often through SkyTeam partners), Aegean Airlines (excellent domestic Greek connections), KLM (via Amsterdam), Lufthansa (via Frankfurt), and Air France (via Paris). Delta can provide seamless transatlantic service and SkyTeam connections; Aegean offers strong onward connectivity to Greek islands with good service quality. KLM and Air France frequently present competitive fares with efficient transfer times in Amsterdam and Paris respectively, while Lufthansa provides broad Star Alliance connectivity. Baggage allowances and seat selection vary—economy fares typically include one carry-on and one personal item, with checked bag policies differing per fare class; always confirm the specific fare rules when booking. CTA: Compare airlines and book the ATL to ATH flight that best matches your schedule, budget, and baggage needs for October.