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Re:As of today, no US passenger airlines operate the Boeing 747 by waqf on Monday January 08, 2018 @01:40PM (#16098750)
But the seat width is determined by the seating configuration and the plane is designed so that one or two particular seating configurations will work well. (Although it matters less for widebodies where there's enough wiggle room to say "this plane will fit 8 reasonable economy seats or 9 ridiculously narrow ones".)
Re:As of today, no US passenger airlines operate the Boeing 747 by zeusk on Monday January 08, 2018 @01:56PM (#16098961)
Nope, airlines decide on the width too. The entire internal layout is up to the airline including the lavatory design.

747 has both 9 and 10 seat wide configuration.

Re:As of today, no US passenger airlines operate the Boeing 747 by waqf on Monday January 08, 2018 @04:25PM (#16100746)
That's why I made an exception for widebodies, although I accept that "making an exception for widebodies" more or less undermines my point.

But I claim that, for example, you can't realistically have a 737 layout that isn't 6 seats wide in coach — and that means the width of your coach seats will be whatever width fits 6 seats plus one gangway.

Re:As of today, no US passenger airlines operate the Boeing 747 by zeusk on Tuesday January 09, 2018 @02:20AM (#16104238)
You can and they did.

Air India and KLM operated 737s with 5 seat config in economy (flew in them) up till last decade.