How could the prophet Eliyahu ascend to Heaven [with his body]? The entire Heavens cannot tolerate even a mustard seed of a body from this world, and you say that he went up in a storm to the Heavens? Like Moshe enclothed in the could on Mount Sinai, Eliyahu enclothed in the storm. [...] No one ascended to the Heavens with his ruach other than Eliyahu.
Zohar, Vayakhel 197a