YOU SAID:

if you're sad, and i'm sad, then who's flying the airplane?

INTO JAPANESE

あなたが悲しい、そして私が悲しいのなら、誰が飛行機を飛んでいるのか？

BACK INTO ENGLISH

If you are sad and I am sad, who is flying the plane?

INTO JAPANESE

あなたが悲しくて私が悲しいのなら、誰が飛行機を飛んでいるのですか？

BACK INTO ENGLISH

If you are sad and I am sad, who is flying the plane?