Airco D.H.2 (various scales)

Geoffrey De Havilland's D.H.2 pusher was instrumental in turning the tide of the "Fokker Scourge" in 1916.   It wasn't the Eindecker's good qualities that led to German dominance, it was the first use of aerial combat tactics and the lack of an effective counter.  When the D.H.2 appeared on the scene in early 1916, the Entente finally had a fighter that could hold its own and -- along with planes like the Nieuport 11 -- could easily outfly a Fokker monoplane.

301 D.H.2s were delivered to frontline units and another 100 were built as trainers.  They served on the Western Front until the late months of 1916, and they served even longer in Palestine, Macedonia, and on Home Defense.

This product comes in both 1:144 and 1:285 (1:288) scales.   The 1:285 product contains two aeroplanes, each with a propeller disk (since propeller blades are hard to print at the smaller scale).  They are joined by disposable links to keep the price down, since single-part models are more affordable.  You can break the links with nail clippers, wire cutters, or similar.

EDIT:  Models at scales smaller than 1:144 may no longer be available.  Shapeways discontinued the material for which they were designed, and the newer materials require that each and every model be adjusted to thicken surfaces like wings.  If you are interested in a particular model in a small scale, please let me know and I will prioritize it higher in the queue.

For more details and gaming information, see https://linen.miraheze.org/wiki/Airco_D.H.2.