The Aero A.18 was a biplane fighter aircraft built in Czechoslovakia in the 1920s.
It was a development of the Ae 02 and Ae 04 fighters Aero had designed during World War I, but also borrowed from the more recent A.11 reconnaissance-bomber design.
The A.18 was designed by Antonin Vlasák and Antonin Husnik and first flew in March 1923, it was one of three prototype fighters that Aero flew that year, but this one was selected for production over the A.19 and A.20 that competed with it.
Twenty machines saw service with the Czechoslovak Air Force in the period between the wars.
5.9 m (19 ft 4 in)
7.6 m (24 ft 11 in)
2.86 m (9 ft 5 in)
15.9 m2 (171 sq ft)
637 kg (1,404 lb)
862 kg (1,900 lb)
1 × BMW IIIa, 6 cyl water cooled inline piston engine,