WWI flying suit?

I hope it's ok to cross-post this, but wondered if anyone knew if the flying suit shown here on the ephemera forum is consistent with WWI? I think the men are American.

Thanks!

https://www.antiquers.com/threads/help-with-handwriting-please-cabinet-card.3656/page-2#post-52285

 

WWII period. They are wearing flying helmets with intercom headphones and leads built in, see the bulging earpieces and dangling leads. Could be a little earlier than WWII but WWI was shouting and hand signals.

 

Thanks for your reply! I was hoping the date might be earlier, but to have it identified is great. I'd been looking at images online and the earpieces look quite different to WWI, but I'm no expert and appreciate the confirmation of the later date .

 

http://www.historicflyingclothing.com/flying-helmets_itemcat_1069