When the first supersonic jet trans port takes off on a commercial flight, it will leave a contrail of money behind it. For SST development costs have far outdistanced early estimates. In 1962, U.S. planemakers figured that it would require $1.5 billion to bui'd an SST.
That figure now stands at $4.5 billion, and a few cost-conscious Congressmen insist that the U.S., rather than pay that price, ought to withdraw entirely from the SST race. Asks Wisconsin's Demo cratic Senator William Proxmire: "Is this the time to spend federal money on this...
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