DELTA has launched codeshare service on Olympic Air’s intra-Greece service on 01JUL10. Codeshare routes and flight numbers below:
| Route | DL Codeshare | OA Operating |
| Athens – Chania | DL7450 | OA534 |
| Chania – Athens | DL7452 | OA533 |
| Athens – Chios | DL7455 | OA766 |
| Chios – Athens | DL7456 | OA763 |
| Athens – Irakleion | DL7453 | OA504 |
| Irakleion – Athens | DL7454 | OA503 |
| Athens – Kefallinia | DL7466 | OA634 |
| Kefallinia – Athens | DL7467 | OA633 |
| Athens – Kerkyra | DL7448 | OA604 |
| Keykyra – Athens | DL7449 | OA601 |
| Athens – Kos | DL7468 | OA732 |
| Kos – Athens | DL7469 | OA731 |
| Athens – Mykonos | DL7457 | OA656 |
| Mykonos – Athens | DL7458 | OA653 |
| Athens – Rhodes | DL7461 | OA706 |
| Rhodes – Athens | DL7462 | OA701 |
| Athens – Thessaloniki | DL7463 | OA908 |
| Thessaloniki – Athens | DL7464 DL7465 |
OA903 OA905 |
| Athens – Thira | DL7459 | OA552 |
| Thira – Athens | DL7460 | OA551 |