Antonyms for "are in mid air" could include "landed," "grounded," "stationary," and "rooted." These words suggest stability, stillness, and groundedness, in contrast to the sensation of being suspended in mid-air. Antonyms can add richness and depth to language, providing opportunities for contrast and nuance. Using antonyms can help to enhance communication and convey a more precise meaning. In certain contexts, using antonyms can also create rhetorical impact and emphasize certain concepts or ideas. Ultimately, the use of antonyms can help to enrich and strengthen one's writing and communication skills.