I'm 6'7". I do my best not to fly (don't really want to be sexually abused) but when I have to, I am fucking miserable.
Yeah, tell me about it. I'm 6'4" (plus a 1/2" extra in the morning) but I have an especially long torso, so we'd probably be eye to eye sitting down. I don't know about you, but the seat in front of me prevents me from slouching the least bit, when I lean my head back on the head rest, my gaze is vertical. It's pretty close to a 90 degree bend, which I try out just for shits and giggles, while other people find ways to sleep.
Pro tip for tall fliers: the foam cushion usually rips off the aluminum seat frame (Velcro). If your ass can handle sitting on the hard, cold metal you might manage enough of a head rest to get a half hour snooze in the mid-flight red-eye hour of total desperation. I've done this many times.
I got stuck on the apron at Schiphol once while they replaced a starter motor. The middle-aged Germanic woman beside me had tree-trunk thighs, clad in tight black neoprene. Our thighs met in a thermonuclear embrace on my side of the arm rest for our entire stay on the apron, plus the return flight to Montreal.
At this point, the airlines can go fuck themselves. I'd rather not leave the ground.