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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.