OBS_VALUE: According to the Civil Aviation Authority, the air carriers shall also respect the  requirements of the HCAA Regulation that are compatible with Community law  (D1/D/30817/2180/9-9-91,   ΦΕΚ Β/727/9-9-91, available at: http://www.ypa.gr/en/air-transport/aircarriers/air-carriers-licensing . See unofficial codified version: https://www.taxheaven.gr/law/4548/2018