That airplane is a Lockheed Constellation L-049, which TWA started flying in 1946. I can't tell due to the glare on the fuselage in photo 7-1, but if it's painted with the word "AIRLINE" (not plural), then the photo is pre-1950, when the company changed its name from Trans World Airline to Trans-World Airlines. The CAB phased out two-letter aircraft registration markings (in this case,
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