A crop harvester is operable to separate grain from severed crop material and broadly includes a threshing rotor, cleaning shoe, and separator pan. The separator pan is interposed between the threshing rotor and the cleaning shoe. The separator pan includes a floor and an air deflector. The floor is configured to urge separated grain on the floor forwardly while allowing a rearward air stream between the floor and rotor to carry material other than grain rearwardly. The air deflector is positioned relative to the floor to direct the rearward air stream above the floor and thereby permit forward grain movement along the pan.