The term "air-to-air" usually refers to missiles or weapons that can be launched from one aircraft to another. Therefore, antonyms for "air-to-air" have to be words that are not related to weapons, aircraft, or missiles. Some words that can be used as antonyms for "air-to-air" are "ground-to-air," "water-based," "non-aerial," "landlocked," or "terrestrial." These words suggest ideas that are opposite to the concept of the "air-to-air" term. For example, "ground-to-air" describes missiles that are fired from the ground towards an aircraft, while "water-based" implies an environment in which the weapons are used in or on water as opposed to air.