Southwest Airlines Install Skinnier Seats To Squeeze In More Passengers (VIDEO)

WATCH: Expect A Tighter Squeeze On Planes...

Airlines in the US are switching out old, bulky seats in favour of so-called 'slimline' models to squeeze in more passengers on their planes.

Airlines have insisted passenger won't notice the modifications, but the changes - covering some of the most common planes flown on domestic and international routes - arguably give the airlines two of their favourite things: More paying passengers, and a smaller fuel bill because the seats are slightly lighter.

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