The <a href="https://en.wikipedia.org/wiki/en:Aero_A.23" class="extiw" title="w:en:Aero A.23">Aero A.23</a> was a Czechoslovakian biplane airliner of the 1920s. Engine Walter-Jupiter 420 HP.
Unknown author<span style="display: none;">Unknown author</span>
Letectví magazine, volume IX, issue 2, page 14, February 1929