“Airplane seats, once 18 or 18½ inches in width, now span just 17 or even 16½ inches on some of the narrowest jetliners.” Beyond airlines moving their 777 aircraft to 3-4-3 from 3-3-3 (except Delta), this is simply not true. The 707, once the mainstay of the sky, had 17.2" seats standard. Same as you’ll find on…