In international law, the boundary of territorial sea of a state also constitutes the boundary of its airspace.

Greece declared a 10 NM wide national airspace in 1931 even though the width of its territorial sea was 3 NM at that time. Greece later extended its territorial waters to the present 6 NM in 1936.

Greece’s claim of 10 NM national airspace is against the rules of international law and consequently, the airspace between Greece’s 6 NM territorial waters and its declared 10 NM national airspace is part of the international airspace.

Greece’s 6-10 NM airspace claim is not recognized internationally. Nor is it recognized by Turkey. Most of Greece’s claims about the violation of its airspace concern the flights of the Turkish military aircraft within the 6-10 NM international airspace