Barrett -
A few years ago Ben Allen, Captain (USAF, ret.), former F-105 Wild Weasel driver and retired Amer/ Airlines captain asked me to paint a 27th Aero SPAD for him. He told me he flew with Hartney's son (might be his grandson....) so had a peripheral interest in the 27th.
Ben is still alive and kicking so if you need confirmation and possible more info, I can sure track it down for you.
Feel free to email me directly -
njaviators@aol.com
-Mike