How Flying Works
Why the Same Seat Feels Different on Each Plane
When the Boeing 777 entered service in 1995, every airline that bought it put nine seats in each economy row, three-three-three, each about 18.5 inches wide. It was roomy for economy, and passengers noticed. Then, one by one, airlines found they could squeeze in a tenth seat. Emirates and Etihad flew their 777s ten across. In 2016 Cathay Pacific, which had kept nine across for years, announced it would go to ten too, with seats about 17 inches wide.
Same aircraft type. Same cabin. An inch and a half less seat. That’s why the most useful thing you can check before choosing a seat isn’t the airline. It’s the aircraft, and how that airline has filled it.
Cabin width decides almost everything
Every airliner’s fuselage is a tube, and the inside width of that tube, the cabin width, is fixed when the aircraft is designed. Airlines decide how to divide it up: how many seats per row, how wide each one is, and how wide the aisles are.
Single-aisle jets like the Boeing 737 and Airbus A320 almost always fit six across. The A320’s cabin is about 3.70 metres wide, the 737’s about 3.54, so the Airbus has roughly 16 cm more to share between six seats and an aisle. Wide-bodies have two aisles and room for eight, nine or ten across, and small changes in layout make a big difference to each seat.
Interactive · cabin cross-sections to scale
Same economy ticket, very different width
- Seats per row
- 10 (3-4-3)
- Aisles
- 2
- Economy seat width
- about 17 in
Ten across: now common, including at Emirates, Etihad, Qatar Airways and Cathay Pacific.
Internal cabin widths. Seat widths are typical published figures and vary by seat model and airline.
The Dreamliner twist
The Boeing 787’s cabin is about 5.49 metres wide. Boeing sized it so that eight seats across would be generously wide. Almost every airline fits nine instead, which brings each seat to about 17 inches. That’s narrower than the 777 in its original nine-across form, which is why the same airline can feel cramped on its newest aircraft and roomier on an older one.
Same airline, same route, different cabin
Airlines often fly several versions of the same aircraft type, fitted out at different times. One 777 might have older business seats, another the new suites. On short notice, airlines also swap aircraft because of maintenance or demand, so the seat map you saw at booking can change. A few habits help:
- Find the exact type on your booking: “787-9” and “787-10” are different cabins.
- Use a seat map that matches it: the airline’s own map, or a detailed one like aeroLOPA that shows windows, exits and galleys.
- Check again a few days before you fly, in case the aircraft has changed.
- Read the seat notes, not just the colours: missing windows, limited recline in front of an exit row, or a fixed armrest at the bulkhead.
Legroom: seat pitch
The other number on a seat map is pitch: the distance from one point on a seat to the same point on the seat in front. It’s the standard way to compare legroom, but it isn’t the whole story. Newer seats with thinner backs can give you more knee space at the same pitch, and an exit row or a bulkhead row changes the picture again. If legroom matters most, compare pitch within the same airline and cabin, then check where the exits are.
Sources & Further Reading
- Cathay Pacific going 10-abreast on its 777s, The Alviator (2016) ↗
- Cathay Pacific: narrow new Boeing 777 economy seat due 2018, Executive Traveller ↗
- Comparing cabin widths of the Airbus A320neo and Boeing 737 MAX ↗
- Why window seats on the Boeing 787 seem the narrowest, Runway Girl Network ↗
- How to handle last-minute aircraft swaps, The Points Guy ↗
- aeroLOPA, detailed aircraft seat maps with window positions ↗
Common Questions
Frequently Asked Questions
How do I find out which aircraft my flight uses?
Your booking, the airline’s app or the flight details page usually name the aircraft type, such as “Boeing 787-9” or “A350-900”. Airlines can swap aircraft, so check again closer to departure, and match the seat map to that exact type and version.
What is seat pitch?
The distance from a point on one seat to the same point on the seat in front. It’s the usual measure of legroom, though thinner modern seatbacks can give more knee space at the same pitch.
Why is the 777 economy seat narrower on some airlines?
When the 777 entered service in 1995, airlines fitted nine seats per economy row, about 18.5 inches wide each. Many now fit ten across in the same cabin, which brings each seat down to about 17 inches.
Are Airbus seats wider than Boeing seats?
It depends on the pair of aircraft and the layout, not the brand. The A320’s cabin is a little wider than the 737’s, so six-across seats can be slightly wider. On wide-bodies, the number of seats per row matters more than the badge.
Which seats have no window?
Rows near the wing or where air ducts run often line up with a wall panel instead of a window. Seat maps that show window positions, such as those on aeroLOPA, help you avoid them.
Last reviewed: October 2026. Facts that change, such as fleets, airspace and airline ownership, are re-checked on a schedule. Spotted an error? Email contact@skyplus.news and we’ll fix it. See how we check facts.