Etihad Airways has signed a codeshare agreement with Greece-based Olympic Air. The agreement, which comes into effect on Tuesday May 18, will allow the Abu Dhabi-based carrier to place its two-letter 'EY' code on services operated by Olympic Air between Athens and Rhodes and Thessaloniki in Greece, the Romanian capital Bucharest, and capital of Bulgaria, Sofia. Etihad offers a daily flight from Abu Dhabi to the Greek capital, Athens.