“How long will it be before the dream of super-quiet, super-efficient airliners becomes a reality?”
23rd century, per Gene Roddenberry. I don’t think he accounted for the woke generation and their Tide pod consumption, though, so it could be substantially longer.
In fact, programming a human being’s matter and energy patterns into a computer at Point A, then transmitting the data and reassembling it at Point B (the Star Trek “beaming” process) is likely more realistic than a battery operated aircraft that can carry the batteries and David and his luggage from Portlandia to Haight-Ashbury at 500 mph.
I’ll just stick with fossil fuels until I depart this life, thank you very much.