Synonyms and related words :
CAT, aerospace, aerosphere, air hole, airspace, bump, ceiling, crosswind, empty space, favorable wind, fog, front, head wind, high-pressure area, hole, ionosphere, jetstream, low-pressure area, overcast, pocket, roughness, soup, space, stratosphere, substratosphere, tail wind, tropopause, troposphere, trough, turbulence, visibility, visibility zero,