Since then, two key legislative packages have been adopted -- the first one (SES I) in 2004, with which the functional airspace block (FAB) concept was introduced as a means for reducing airspace fragmentation, and a second set of measures (SES II) in 2011.
De atunci au fost adoptate două pachete legislative – primul (SES I) în 2004, prin care s-a introdus conceptul de bloc funcţional de spaţiu aerian (FAB) ca mijloc de a reduce fragmentarea spaţiului aerian, iar cel de-al doilea set de măsuri (SES II) a fost adoptat în 2011.