open sky
Ceiling-free blue above
Open sky refers to unobstructed sky, free of clouds, buildings, or other barriers—the sky as a vast, accessible expanse: We slept under the open sky.
In aviation and trade, open sky (often open skies) describes agreements allowing unrestricted air travel between countries: The open skies treaty increased transatlantic flights.
- vastExtremely great in size
- endlessWithout termination or boundary
- horizonApparent earth-sky meeting
- bluePrimary color; also sad
- cloudsAirborne water masses
cloud nine · freedom · free as a bird · expanse · soaring · wild blue yonder · limitless · heavens · aerial · boundless · clear · starry · infinite · flight · birds · sunrise · sunset · atmosphere
- skyclouds, cloud, sun, moon, stars
- sky viewssunshine, sunlight, sunrise, sunset, stars
- Plains Landscapesplains, prairies, grasslands, grassland, flatland
- steppegrassland, Pontic steppe, flat terrain, sparse vegetation, windswept plains
- countrysidefarmhouse, farm, barns, farmyard, barn
- ruralfarm, farmhouse, barn, cornfield, tractor