>French Air Service</a></li>
<li><a href="//en.wikipedia.org/wiki/Imperial_Russian_Air_Service" title="Imperial Russian Air Service">Imperial Russian Air Service</a></li>
<li><a href="//en.wikipedia.org/wiki/Regia_Aeronautica" title="Regia Aeronautica">Italian Military Air Corps</a></li>
<li><a href="//en.wikipedia.org/wiki/United_States_Army_Air_Service" title="United States Army Air Service">United States Army Air Service</a></li>
<li>Greek air services
<ul>
<li><a href="//en.wikipedia.org/wiki/Hellenic_A