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Since coach travel is generally awful there are several entrepreneurs who come up with things they can sell you to make yourself more comfortable, simple solutions to real world problems.
Some passengers buy extra pillows. I even brought an extra pillow flying American Airlines business class Paris – Dallas last year. This was before American introduced new Casper sleep amenities. I felt like a teenage girl bringing my own pillow but I was more comfortable inflight.
The knee defender is meant to keep someone from reclining their seat into you. Of course that’s just a recipe for conflict — and even flight diversions after you get into a fight with the person in front of you that you’ve prevented from reclining. And many airlines ban the device.
Want extra tray space in coach? Bring along a tray that you can attach to the window.
In the same spirit there’s the portable arm rest divider. (HT: @katechisholm) It’s “a folding device that doubles the area of an armrest, clipping onto a seat .. to give users on either side their own space.”
The goal is to ‘end elbow wars’ but I think you need your seat opponent’s permission before using it. It’s no big deal if you’re traveling with a companion, but you don’t usually have conflict to solve with a companion (and many armrests are movable and you can just put it up traveling with someone you know). So my guess is this isn’t a solution to the problem, but you can check it out on Amazon where it sells for $29.50 with Prime shipping and free returns.