Descripción : 2 covers with Kennedy Space Center post stamps and Comstar D 4 satellite.
When two domestic communications satellites were launched into synchronous orbit during 1976, a new era in long distance calling began for the nation`s phone customers. Relaying calls back and forth across the country, the satellites, called Comstar, were used jointly by the American Telephone and Telegraph Company and GTE Satellite Corporation, a subsidiary of General Telephone and Electronics.
The first Comstar was launched 13 May 1976, and started commercial service in early July. Although its design life was 7 years, its operational lifetime was nearly 8 1/2 years. Comstar 2 was launched 22 July 1976, and provided 17 years of service from 76.6 degrees W longitude. The third Comstar was launched 29 June 1978, and began service in August. Comstar 3 completed nearly 8 1/2 years of service. Comstar 4, launched 21 February 1981, has completed 17 years of service from 75.4 degrees W longitude.

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COMSTAR D 4 · aka COMSTAR 1D, PARALLAX 1, ESIAFI 1 (SATELLITE) · ATLAS SLV3D