The enforcement of competition law within the air transport sector warrants special consideration for three reasons. First, the ongoing liberalization of air transport related markets within the Community and between the Community and third countries contributes to the distinctive quality of competition law issues within the air transport sector. Second, a distinct group of block exemptions had, at some point, been adopted addressing issues relevant only to air transport. Third, a large body of substantive case-law specific to air transport has developed over the year, which is essential to any consideration of air transport competition issues.