I've only flown on 100 and 200 series 747's. I thought the Braniff 747-127 and 747-123 were the best. They had 9 abreast seating in economy that was very comfortable. They also served their normal first class meals in economy on their 747 flights to HNL. The meals they served on 747 first class were comparable to meals served at five star restaurants.
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I liked Braniff, too. It's a shame the didn't take some lessons from Herb.