Tenkuu no Escaflowne, Noein: Mou Hitori no Kimi e Recommendations
Both directed by Kazuki Akane, and they have pretty much the same atmosphere and space-travel setting. Some characters bear a lot of similarities too.
The initial idea is similar, though its realization is different. Perhaps Noein is something like a postmodern retelling of the fairytale that is Escaflowne (Kazuki Akane worked on both projects as a director).