Boeing 777-300ER

The Boeing 777-300ER is a large twin-engine long-haul widebody and, for many years, the backbone of intercontinental flying for the world's biggest airlines. It is a stretched, longer-range version of the 777 and still carries huge numbers of passengers on trunk routes between major hubs. If you are on a very full long-haul flight to or from a big international gateway, there is a fair chance it is a 777-300ER.

Economy is the key thing to understand about this aircraft. Boeing designed the cabin around a comfortable nine-abreast, but the majority of airlines now fly it ten-abreast, three seats then four then three across two aisles, which trims seat width noticeably. A minority keep the roomier nine-abreast. That single decision, made by each airline, is the biggest driver of how the flight feels in the back.

The 777-300ER shows operator differences as starkly as any aircraft. Up front you might find a first-class cabin, a modern business suite, or an older business seat, plus a premium economy that may or may not exist. But the decision that affects the most passengers is the economy width: the same airframe is a tolerable nine-abreast on some airlines and a tight ten-abreast on most, and there is no way to tell from the aircraft type alone.

It is a long, wide cabin with several galley and lavatory zones splitting the sections, and how your row sits relative to those is a per-airline layout choice. The interactive seat maps for each operator on this hub let you compare width, premium products and service-area placement side by side before you book.

In economy, the biggest single factor is whether your airline flies nine or ten abreast, so check that first on the seat map before anything else. Beyond width, favour seats clear of the mid-cabin galleys and lavatory banks for a quieter flight, and treat the two central seats in a ten-abreast middle block as the ones to avoid. Bulkhead and exit rows give more room but can be noisier and lose storage.

Because the cabin can be so different between carriers, the airline configurations above are the place to start. Pick your operator, open the full seat map, and let the seat-by-seat ratings show you where the good and compromised rows sit in that specific 777-300ER layout.