Were the prophets whom the Messenger of Allah, peace and blessings be upon him, saw in each heaven during the Isra and Mi'raj present with their bodies upon planets or in the air, or was their presence by spirit only?

The texts of the Quran and Sunnah indicate that the heaven is a celestial body, possessing gates that open, and that Allah built it, raised it, and holds it. As for its nature (whether transparent or solid), we do not know. Regarding the Prophet's meeting with the prophets in the heavens, either their souls materialized in the forms of their bodies, or their bodies were brought as an honor and a tribute to him.