So A and K are window seats; C, G seats with aisle on the right; D, J seats with aisle on the left; B,E,F middle seats.
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Most airlines have a different fare class for each letter of the alphabet, and this varies by airline: F is first class, C and J are typically business class, and Y is usually economy, regardless of the airline.
Occasionally, aircraft with a seating structure of 2+2 may letter the seats as ACDF to keep with the standard of A/F being window and C/D being aisle on short-haul aircraft (which generally have 3+3 seats).
With the larger/denser designs, I'd say an aisle on the edges is better than an aisle in the middle, since you're at least somewhat near a window. An aisle in the middle of a 3-3-3 only has one person that might need to climb over you to get to the toilet. It's also better than a middle seat anywhere.
Occasionally, aircraft with a seating structure of 2+2 may letter the seats as ACDF to keep with the standard of A/F being window and C/D being aisle on short-haul aircraft (which generally have 3+3 seats).
aisle seat (plural aisle seats) A seat beside an aisle in public transport, as in a bus, train or passenger aircraft. A seat beside an aisle in a theater, auditorium, or stadium.
Occasionally, aircraft with a seating structure of 2+2 may letter the seats as ACDF to keep with the standard of A/F being window and C/D being aisle on short-haul aircraft (which generally have 3+3 seats).
There's a similar scheme on widebody two-aisle jets involving more letters of the alphabet. (A B. G H) for business on the same jet. On widebodies, A and H are always window seats.
All major airlines letter seats from right to left as you are standing in the aisle facing the rear of the plane. Thus seat “A” is always next to the right window.