airspace
n. uncountable B2 Upper Intermediate US //ˈɛɹˌspeɪs// UK //ˈeəspeɪs// airspace
n. the part of the sky that is above a specific country. Governments control who can fly planes through this area.
n. the portion of the atmosphere above a particular land mass or body of water, subject to the jurisdiction of a specific nation or authority.
The pilot requested permission to enter the country's airspace.
Commercial airlines must follow strict routes to avoid entering restricted military airspace without authorization.
Diplomatic tensions escalated after several fighter jets were accused of violating sovereign airspace during a series of unannounced naval exercises near the border.
From air + space.