This paper uses a unique database of aviation terrorist attacks to analyse the phenomenon of airport attacks. The evolution of aviation terrorism is described with a particular focus on airport attacks, using empirical and historical data to form a factual baseline for historical analysis and policy recommendations. The authors make a distinction between acts of unlawful interference, the all-encompassing term the International Civil Aviation Organization uses, and actual terrorist attacks against civil aviation. While statistics demonstrate that airport attacks have been perpetrated steadily since the 1970s, with no major fluctuations in recent years, they also demonstrate that airport attacks may have the potential to become more lethal than ever before. Analyses and guidance are also provided on how to better protect airports, suggesting that the hardening of aircraft as targets has actually transferred considerable security risk to airports. To effectively secure the air transportation system, a three-pronged approach to aviation security is proposed, transcending airport security and reaching far beyond aviation in its scope.