Seat Numbering Viewed from the floor, seats are numbered across the row from left to right, beginning with 1. The rows are numbered from the bottom of the section to the top, also beginning with 1.

In the aviation industry, seats are almost universally labeled alphabetically from left to right when facing the front of the aircraft (toward the cockpit). In a standard narrow-body jet with a 3-3 configuration, seat A is the window seat on the left, B is the middle, and C is the aisle; across the aisle, D is the aisle seat, E is the middle, and F is the window seat on the right. This standardized system helps crew and passengers navigate the cabin quickly. Interestingly, some airlines omit the letters I and Q to avoid confusion with the numbers 1 and 0, and on smaller aircraft with fewer seats, letters may be skipped (e.g., A-C and D-F) to ensure that "A" and "F" always represent window seats regardless of the cabin's total width.