I was on a Southwest 737 years ago landing in Midland. It's the only time I was worried about a landing. Plane was oscillating from side to side as it came in. Went from seeing ground to sky to ground to sky, etc. out the window. I figured the pilot would have to do a go around to keep from grounding a wingtip, but it was one of the smoothest landings I ever experienced. Had to compliment him on his skill.

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Or something like that . . .