wow wtf, 130 aircraft held off 3,800?????
What Charge said about the Winter War air war...
FiAF couldn't really "hold off" the Soviet Air Force. FiAF fighters couldn't stop Soviets from bombing Finnish cities/towns. When Soviet bomber flights were intercepted by Finnish fighters they usually suffered sizable losses but vast majority of the sorties didn't encounter opposition. Soviets could simply fly so many sorties that they largely saturated Finnish fighter defense. The point is that considering the minuscule numbers of the FiAF fighters, the losses they inflicted to the Soviet bomber forces is very very impressive IMO.
Because the fighters were tasked mainly to defend civilian targets, Soviet fighters could fly over the front and just behind it more or less unopposed. They did a lot of strafing attacks and at worst times this was far more than just a nuisance but became something that started having implications which were even strategic and tactical in nature.
Finnish Air Force couldn't really "stop" Soviet air force from doing what it was doing but the times Soviet aircraft ran into Finnish air units, they usually either lost an aerial engagement or managed to run away. There are of course exceptions but this was generally the nature of the Winter War's air war.