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How soon will supersonic jets return to our skies?

by Paul Sillers, CNN Travel

A new era of supersonic flight might be just around the corner, but there are three challenges to overcome when it comes to flying faster than the speed of sound.

Those are the three Es of aviation: engineering, environment and economics.

Concorde, the aeronautical marvel that made its last flight 16 years ago this week, only conquered the first of those three travel challenges.

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