The PZL.37 Łoś ('moose') was a Polish twin-engined medium bomber designed and manufactured by national aircraft company Państwowe Zakłady Lotnicze (PZL). It is also known as "PZL P-37" or "PZL P.37", but the letter "P" was generally reserved for fighters of Zygmunt Puławski's design.

The Dornier Do 17 is a twin-engined light bomber produced by Dornier Flugzeugwerke for the German Luftwaffe during World War II. Designed in the early 1930s as a Schnellbomber intended to be fast enough to outrun opposing aircraft, the lightly built craft had a twin tail and "shoulder wing". Sometimes referred to as the Fliegender Bleistift or the Eversharp it was popular among its crews due to its handling, especially at low altitude, which made the Do 17 harder to hit than other German bombers.