I wasn't but a child during the cold war, only some 14 when they tore down the wall.
But I believe that eventhough the war was cold at times, there are no deliberate shoot downs of civilian airliners by the NATO side, where the aircraft has been identified.
Didn't Soviet airliners stray into NATO airspace? Or were the Soviets just more anxious than we were? Or were we just better at the whole intercept and lead out again thing?