If you butterfly away the Nazis, then the Finnish Airforce would probably still be using the Swazstika. It was an ancient Finnish symbol of good luck before the Nazis adopted it.
So it was, a very
Kalevala-ish symbol (
hakaristi, etymologically from the same base as
hakkors or
Hakenkreutz). This has to be pointed out because today is Aleksis Kivi Day aka the Finnish Literature Day...
The swastika was by used the national romantic painter Akseli Gallen-Kallela since the 1890s as a decorative motif in many of his Kalevala-themed works. After 1917 Gallen-Kallela received a commission to design most of the heraldry and symbols to be used by the young nation, presidential and military decorations etc. etc. and put the swastika almost everywhere.
This was to be sort of an embarrasment later, for example when President De Gaulle received the
Grand Cross of the Order of the White Rose from President Kekkonen in 1962, with a chain heavily laden with swastikas...
The chain was modified the following year.
But for the specific use by the Finnish Air Force the swastika was appropriated from the Swedish Count Eric von Rosen, who had used is as his personal lucky symbol at least since 1901: it was painted on the Morane-Saulnier Parasol he donated to the Finnish Army in 1918.
Von Rosen, however, was not a stranger to Nazis. He was a prominent member of the Swedish national socialists in the 30s, and his wife's sister was Hermann Göring's first wife. It was not so simple, though: Von Rosen and Göring, the avid aviationists, had met before Göring joined the Nazis, who, in turn had adopted the swastika also before Göring joined forces with them. So the connection with von Rosen's swastika and the Nazi one was almost certainly merely a shared fascination with Germanic mythology.
After the formation of the Finnish Air Force as a separate entity, Gallen-Kallela had to design the pilots' badge. With the availabel options, he was more than happy to give the swastika a prominent part in it. And it stuck. (When I did my time in the service, being Air Force, I still marched in a parade following a flag with a swastika in it.)
Thus you are right: in many Naziless timelines Finland would be probably the only nation in the world that has the swastika as a national symbol for the air force and maybe for armored units too (as it was OTL).
Maybe it would even be known as the "Finnish cross" ITTL...
