Photograph by WikimediaPuerto Rico, 18.22141715, -66.41328185056482011The Douglas DC-7 represented the most important development in airline technology since the DC-3, a pre-World War II plane. With its pressurized cabin, the DC-7 offered a high standard of comfort to air travel and was widely adopted among the major airline carriers for long-haul traffic. It held sixty-nine seats and cruised at 360 miles per hour.image/jpeghttp://rightsstatements.org/vocab/UND/1.0/Airplanes--United StatesAirlines--United StatesFlightDouglas DC-7 (Transport plane)Douglas transport planesEastern Air Lines, inc.Douglas DC-7StillImage