Several years/decades ago, there was a short lived animated series
where combat pilots from different eras/wars were recruited to combat bad guys with futuristic jets. One of the recruited pilots was a WWI German Ace with his Bi-Plane that was modified to transform into a jet of sorts.
Does this sound familiar to anyone?
Also, one of the "bad guys" was female named "Siren".
That's all I can remember.