No. In Jainism, a kevalī is beyond hunger and ordinary bodily desire, so they do not eat food in the normal sense. They also do not “eat through air.”

A kevalī may still remain in a body until the end of that life, but that body is no longer sustained by craving or attachment to food. The essential point is: kevalī is spiritually पूर्ण — free from need, attachment, and craving.

If you want, I can also explain the Jain view of how the body of a kevalī continues after kevalajñāna in simple words.