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Cast your mind far, far back to the days before cell phones... When travelling internationally, how would you make a phone call? Perhaps you used a pre-paid phone card. United Airlines offered these calling cards to passengers through their mileage reward programs. Do you remember using phone cards? United Airlines, Mileage Plus mileage program phone card 1997 SFO Museum Collection Gift of Kurt Bodden 2016.043.014 - United Airlines, Mileage Plus mileage program phone card 1997 SFO Museum Collection Gift of Kurt Bodden 2016.043.017 This image was posted on September 26, 2018.