OK, just "aircraft", not "military aircraft"?
SR-71--So far ahead of it's time it was spooky.
Caproni CA-60-- could you imagine (if it had gone into service as envisioned) flying across the Atlantic in that thing? Talk about a white-knuckled flight!!
I like it because it was so improbable.
Su-34-- Because it looks sooo cool, and like I said before,it has a bed, kitchen and toilet, and can fly rings around any other
plane.................................... that has a bed, kitchen and toilet!
Extra-300-- an inverted flat spin is so much fun!
AN-225-- size matters