It is entirely possible that the "chase" plane taking the photograph happened to be one coming out of major maintenance while performing their MX test flight out over the Atlantic and back. I narrowly missed an opportunity to fly along on one of those flights to test my product, and that would have been a huge high-point in my aviation career. Years later, walking through the static display at Boeing Flight Museum in Seattle was a bit claustrophobic. I was surprised how compact they were for all the "big names" who'd flown them on London-New York route.