Description : 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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Space Event :

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