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<ul>
<li><a href="//en.wikipedia.org/wiki/Luftstreitkr%C3%A4fte" title="Luftstreitkräfte">Imperial German Air Service</a></li>
<li><a href="//en.wikipedia.org/wiki/Imperial_and_Royal_Aviation_Troops" title="Imperial and Royal Aviation Troops">Austro-Hungarian Imperial and Royal Aviation Troops</a></li>
<li><a href="//en.wikipedia.org/wiki/Ottoman_Air_Force" title="Ottoman Air Force">Ottoman Air Force</a></li>
<li><a href="//en.wikipedia.org/wiki/Bulgarian_A