Here is a brief snapshot Order of Battle for the Finnish Air Force at the opening of BARBAROSSA. The list of squadron assignments varied greatly throughout the war, and as is often the case, sources conflict.

LeR 1 (Lt. Col. V. Rekola)

TLeLV 12
one flight of Mercury D.XXIs
one flight of Twin Wasp Jr. D.XXIs
one flight of C.Vs (8 aircraft)

TLeLV 14

Curtiss Hawk 75A-6 (6 aircraft)
various Fokker biplanes

TLeLV 16

one flight of Fokker C.Xs
one flight of Westland Lysanders
one flight of Gloster Gladiators

LeR 2 (Lt. Col. R. Lorenz)

HLeLV 24
Brewster 239s ["Buffalos"] (40 aircraft)

HLeLV 26 Fiat G.50s (25 aircraft)
HLeLV 28 M.S. 406s (29 aircraft)

LeR 3 (Lt. Col. E. Nuotio)

HLeLV 30
one flight of Hawker Hurricane Is
one flight of Mercury D.XXIs

HLeLV 32

Mercury D.XXIs (17 aircraft)
Twin Wasp Jr. D.XXIs (19 aircraft)

LeR 4 (Lt. Col. T. Somerto)

PLeLV 42
Bristol Blenheim 1 (9 aircraft)

PLeLV 44

Bristol Blenheim 1 (9 aircraft)

PLeLV 46

Bristol Blenheim 1 (6 aircraft)
Bristol Blenheim IV (3 aircraft)

Autonomous

TLeLV 6
SB-2 and SB-2bis (6 aircraft)
Hover MF 11s
Blackburn Ripon II

LeR

Flight Regiment

TLeLV

Ground Liaison / Reconnaissance Squadron

HLeLV

Fighter Squadron

PLeLV

Bomber Squadron