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You'd have a point if they didn't say "the comparable Boeing aircraft". There is nothing "comparable" about the two given Boeing's other offerings, they're not in the same class or generation.

> comparing planes they've flown on

The airline matters too - some have larger seats with more amenities and more space between rows. Those extra inches really matter on long haul flights for those of us who are tall!

I think you're right that they're comparing planes they've flown on, but they're trying to compare very different designs from very different eras.