Some planes have one window seat and one aisle seat per row, providing more space between passengers.
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Because these seats cost extra, you're less likely to have a neighbour.
This section is directly over the wings, the plane's most stable area and centre of lift, so sitting here makes for the smoothest ride if turbulence hits.
You'll also have other passengers waiting around you to use the restroom.
In the galley, the crew prepares in-flight meals and drinks. They're usually in the front and back, but larger planes may have one in the middle.