Those names Piper and Scout really match stylistically. Scout is especially charming. <3
I had no idea about the plane association.
Out of your other suggestions, I find Arden lovely. Sutton really grows on you too - much more than Bailey and Brooklyn - but I have to tell you, I think I'm in the minority on that one: it would definitely provoke the most divisive reactions of all the ones you've listed.
My grandpa was a pilot and so is my cousin and I never would've known.
I like your sibset a lot, and Scout is my fave of your choices.
no i didn't know the associate
If it makes anyone feel better... I prefer Oakley and Rowan on boys and a lot of people would consider those girl names.
Scout has really been growing on me lately, and it's nice to know that no one noticed the association! It's officially added to the short list. :)
I didn't get the connection either. lol However, if y'all run in a plane-nerd circle it might be noticeable. I personally love the 2 together as a sibset :)