Just a note, airline seats are built in such a way that force you to hunch over. It's baffling. You can't sit with your shoulders back. They sit in a dip that i

Just a note, airline seats are built in such a way that force you to hunch over. It's baffling. You can't sit with your shoulders back. They sit in a dip that is right below a decline which pushes your shoulders forwards and inwards. I never hear anyone mention this, but it's so self-evidently bad it must be done on purpose.