The term "be mid-air" implies an object or a person is hovering or suspended in the atmosphere. Its antonyms are "grounded," "landed," "docked," "anchored," or "settled." These terms represent a fixed or stable state, indicating that the object or a person is firmly placed on the earth or another surface. Being grounded or landed is a common state for airplanes, birds, and helicopters after they finish their flight. Docked and anchored are more commonly used for boats and ships, indicating that they are securely attached to a port or a harbor. Settling, on the other hand, refers to something coming to rest after being in motion or flight.