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Regular Issue Air Mails1962Jetliner over Capitol BuildingC64%u2014December 5, 1962Jetliner over Capitol Building, Booklet PageC64b, slogan 3%u2014December 5, 1962Jetliner over Capitol Building, CoilC65%u2014December 5, 1962Jetliner over Capitol Building, Booklet PageC64b, slogan 2%u2014December 5, 1962Jetliner over Capitol Building, Booklet PageC64b, slogan 1%u2014December 5, 1962This stamp was issued to conform to new postal rates which increased the cost of domestic Air Mail from 7%u00a2 to 8%u00a2. As part of an experiment to expedite the sorting of Air Mail letters, a special phosphorescent ink was used on some of these stamps. It was invisible to the naked eye, but could be detected by ultraviolet sorting equipment, and was visible under ultraviolet light.