Break it down, and simplify. A 3D wing is creating lift via propulsive mechanism, by vortex-shedding (which is very unlike the venturi-effect forces of an airfoil-section in the 2D world of textbook flow diagrams.)
To construct an intuitive 3D fluid model, imagine that the aircraft is assembling bags of air, then flinging them downwards. (Let the bags' own mass be insignificant, like giant dry-cleaning bags, or imagine that the craft is flinging giant chunks of aerogel!) The aircraft receives an upwards F=mA force as it accelerates and releases each air-bag. That's the first N3 force-pair.
The aircraft flies away, and doesn't interact any further with each descending bag. But the bags experience viscous drag. They will accelerate the surrounding air downwards, and themselves be slowed. They produce an enormously wide pattern of entrained descending air. If no ground was present, they'd entrain a wide portion of the atmosphere, which would move downwards. But if the ground prevents this, then the bags would come to a halt wrt the ground, and a very wide pressure-pattern would appear on the ground. That's the second, independent N3 force-pair.
In other words, what will happen on the ground if a down-moving sphere of air is decelerating because of viscous drag? Now just sum the effects of a long string of such descending spheres, and we have the ground-pressure distribution caused by aircraft vortex-wakes.
(Now add force-propagation acoustic limits ...and this simplified picture doesn't apply very well.)