In the vast majority of commercial aircraft, Seat C is an aisle seat on the left-hand side of the plane (when facing the cockpit). For standard narrow-body aircraft like the Boeing 737 or Airbus A320, which typically have a 3-3 seating configuration (A-B-C | D-E-F), Seat A is the window, B is the middle, and C is the aisle. On larger wide-body aircraft with a 2-4-2 or 3-4-3 layout, Seat C remains an aisle seat, though it may be paired differently depending on the specific cabin. Frequent travelers often prefer Seat C because it allows for easy access to the overhead bins and the restrooms without having to ask others to move, and it provides a bit more "shoulder room" into the aisle. However, the downside is that you may be bumped by the beverage cart or other passengers walking through the cabin. Always check your specific aircraft's seat map, but if you see "C" on your boarding pass, you are almost certainly in the aisle.