Here is the fourth and final miniature sheet issued by Finland for the Finlandia '88 Stamp Exhibition in Helsinki. These four sheets are all transportation themed. This one (Facit #BL4) featuring aviation was issued on June 2, 1988. Each of the four stamps has a colored frame which matches its route flown as illustrated on the map on the sheet.
Note that the Breguet 14 biplane has a swastika emblem on its tail. This emblem has nothing to do with Germany, nazism, or the third reich. It was the emblem of the Finnish Air Force from its inception, and it has been used until quite recently, when the decision was made to discontinue the tradition.
Breguet 14 biplane (Finnish Air Force 1920)
Douglas DC 3 (1947)
Junkers F 13 (1930)
Douglas DC 10-30 (Finnair 1975)