"Launching investigation missiles now."
The fighter pilots soon realized that what they were encountering was a passenger plane (possibly because of all the passengers mouthing "PLEASE DON'T SHOOT US DOWN" at their windows), but their commanders were adamant that the capitalist aircraft must be given the ol' Michael Bay treatment. Soviet pilot Alexander Bosov reluctantly launched two missiles.
The first missed; the second knocked off a largish chunk of KAL 902's left wing. Shrapnel from the blast perforated the cabin, killed two passengers, depressurized the plane, and knocked out one of its four engines ... but KAL 902 kept flying. Captain Kim kicked the Boeing 707 into a terrifyingly steep dive to get his passengers to a breathable altitude, dropping from 35,000 feet to just 5,000 before plunging into some clouds and completely losing the pursuing interceptors. It's not entirely clear whether or not he was trying to lose them, but if a commercial airline pilot actually managed to evade fighter jets without even trying ... well, that's even more impressive.
An dramatic re-enactment of Kim's escape.
Kim literally flew under the radar for 40 minutes with half a left wing and one altogether missiled engine before making a nighttime, gear-up crash landing on a frozen lake in the frigid bumfuck of Northern Russia, less than 90 miles from the Finnish border. With the exception of the two passengers who were killed by the actual missile strike, everyone on board survived.
Of course, the remaining 107 were quickly conscripted into the White Walkers' army.