Modern Dispatch (Issue 127 - 2008)

From publisher blurb:

Knights of the Sky is designed to make a GM's job easier by providing a resource with information (and, in some cases, stats) for various characters from the Allied (aka Entente) Powers in the air battles in the Great War and Dragon War conflicts in Soldiers and Spellfighters20 universe. In a pinch, these statblocks could even serve as PCs for a quick game.
We have also included some new magical items, stats and descriptions for new air vehicles.

Although these characters are vehicles are based in fact - this is an alternate history/historical-fantasy setting and shouldn't even be considered as a loose reference to actual World War One history.