Aviation: Slowdown for the SST

Almost from the start, the U.S. effort to build a supersonic jet transport has been buffeted by technical, financial and political turbulence. The resulting delays have already set back development of the plane by at least a year. Last week the Johnson Administration let it be known that the SST faces a further slowdown, which will keep it from entering airline service at least until 1976 or '77, instead of 1974, as originally planned.

Glitches & Goofs. The official explanation for the latest snag was continuing trouble with the Boeing Co.'s design for its swing-wing B-2707. There were hints...

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