This is a photo taken in 1950s on KLM. At the time, Martin M-130s, Lockheed Constellations, and Douglas DC-6s operated by airlines such as KLM and the now-defunct Trans World Airlines (TWA) had beds in both the upper and lower berths. These beds featured mattresses, Pullman-style curtains for privacy, windows, reading lights, and even breakfast-in-bed service. At the time, a round-trip economy airfare from New York to London on a Boeing 377 Stratocruiser cost about $580 (about $12,000 today)
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