ive noticed most 747-400 carriers use a 3-4-3 seating which is ten abreast. now ive also noticed that most carriers of any version of the 777 use a 3-3-3 seating which is 9 abreast. now i know the 747 is wider but its only like 9 inches wider so why not add that extra seat in there?
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Take UA for example, who operate both aircraft. Their 777s have 18" wide seats, while the 747s have 17" wide. On the other hand, Emirates flies the 777 in a 3-4-3 setup with 17" seats. They make up for it with slightly increased seat pitch and a narrower aisle. Why they don't add the extra row is an airline preference. You have to remember that evacuation capability, added weight (of seats, extra F/A's, service items), in-flight service, demand, all play a role.
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