Potential US WWI Aviation Insignias

[Linasl]

Hello Everyone. I am a collector and eBay seller.  I have the opportunity to bid on auction what the house claims are US military WWI aviation insignias.  Can you please take a look at the two scans and let me know what you think, as well as what they are? Two of them aresilver.

Thanks. Linas

[Hugh]

The first item is similar to both the 103rd Aero Squadron and the 94 Pursuit squadron insignia (Lafayette Escadrille}, however, doesn't look like official US Army issue.  More like a sweetheart pin.  

Don't recognize # 2 or 3, but # 3 is more like official issue US Army WW I insignia.  Blackened, fastener on reverse.  

[Linasl]

Thanks Hugh!