- The portion of the atmosphere above a particular land area, especially that of a political subdivision such as a nation.
- The space occupied by an aircraft.
- A designated sector of space, such as that in the vicinity of an airport.
- Chiefly British Space available for broadcasting within a particular frequency: "Mobile radio has to compete for air space with other services such as broadcast radio, television, and even military services” ( Financial Times).
- See airtime.
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