The AP reports that American airplane passengers, squeezed by increasingly tight seating aboard planes, are lashing out, actually getting into in-flight fights over knee room: Three U.S. flights have made unscheduled landings in the past eight days after passengers got into fights over the ability to recline their seats. Disputes over a tiny bit of personal space might seem petty, but for passengers whose knees are already banging into tray tables, every bit counts. ... Southwest and United both took away 1 inch from each row on certain jets to make room for six more seats. American is increasing the number of seats on its Boeing 737-800s from 150 to 160. Delta installed new, smaller toilets in its 737-900s, enabling it to squeeze in an extra four seats. And to make room for a first-class cabin with lie-flat beds on transcontinental flights, JetBlue cut the distance between coach seats by one inch.