Air circulation patterns aboard standard commercial aircraft are side-to-side (laminar), with air entering the cabin from overhead, circulating across the aircraft and exiting the cabin near the floor.
Know that it's also the largest car by far, with the most shoulder, backseat and overall cabin capacity, making it darned near the best highway cruiser this side of an S-Class (and for a good 20 grand less).
The airline considered putting the couches across the four seats in the middle of the 777-300 coach cabin, but people in the tests preferred three seats on the side, where they felt less exposed and more like they were in a private cocoon.