But NATO has a lot more reserves esp coming in from north America
Quantitative advantage in air too is with the west
Leaving aside the dubiousness of this claim (NATO at it's best drew slightly above even with the Soviets) it is a total non-answer to the actual problem. Which is that casualties are liable to be too intense for either side to sustain for long.
Additionally, one of the odder lessons that was observed from the Kosovo conflict is that although Serbia's small number of poorly maintained MiG-29s would
seem like they'd be just targets for NATO fighters, they and the SAMs did create some space for the Serb ground attack aircraft to operate. Below the NATO CAPs and bombers, the Serbs flew several hundred ground attack sorties into Kosovo with strike aircraft and helicopters. Despite NATO air superiority, none of these aircraft were shot down by NATO planes, although one J-22 did crash, likely from flying at low altitude. The Serbs even got several air to air kills against UAVs, the unsung casualties of Allied Force with 25 lost, 19 to some combination of enemy action (numbers vary a little by source). Because they could be difficult to target with high speed fighters, one innovative tactic used by the Serbs was to fly an Mi-8 up beside a UAV and blow it away with the door gunner. The British lost several Hunters to this method.
Anyway, the lesson this has for a 1985 WW3 scenario is obvious: even if the VVS loses air superiority to NATO, its fighters will be able to continue flying. This would require a mental shift to aerial guerrilla warfare, rather than slamming into NATO head on, however if the Warsaw Pact accepts the truth that they're losing air superiority (which is easier for them then for NATO, as they never relied on airpower in their plans to the extent NATO did), there's still options open to them. Warsaw Pact SAMs are numerous and hard to suppress, would be able to mount defenses of vital locations, make flying over the frontlines hazardous, and inflicting their own attrition. Maskirovka and deception could be mitigate damage from NATO deep strikes. Once dispersed to other bases, small numbers of Soviet strike aircraft armed with ground attack munitions should regularly be able to slip through and do damage or, when armed with air-air munitions, pounce on the occasional NATO strike package and maul it.
Of course the converse is true. In the event that the Warsaw Pact managed to win the air war (possibly to early massed strikes on NATO airbases), there will still be large numbers of NATO strike planes and helicopters operating over the front, striking WP forces.
But because of each sides extensive air defense systems (both on the ground and in the air), it's all liable to be just dropped in the bucket. And it doesn't matter if NATO gets the upper-hand in the air war if it's just in time for Soviet ground forces to roll over their airbases with tanks. There's no better AA weapon then parking your tank on your enemies runway.