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Today, we cannot fly 100 passengers at Mach 2 to 60,000ft. Apparently a plane once flew as early as 1968 that could do it. It's claimed 16 were built and ran such a service for decades. As it can't be done today, then the whole Concorde scene must be a hoax and the thousands of passengers plus crews are lying to us all... See the point? It's a worthless argument.
Since the final moon landing of December 1972, no astronaut has set foot upon the moon. Why not? We can't get an astronaut on the moon today. Aha! If we can't do it now with 21st Century technology then how could the USA possibly do it in the 1960's and 1970's?
It must have been a hoax!
Passenger airships used to cross the Atlantic but no longer. Several times in history, we have ceased a service for one reason or another. We need to think carefully and logically to arrive at an intelligent conclusion instead of an instant reaction.