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Re:United Airlines will buy 15 planes from Boom Supersonic by hedora on Thursday June 03, 2021 @03:40PM (#27386318)
It took Boeing 3 years to design and start mass production of the 747 (1965-1968):

https://en.m.wikipedia.org/wiki/Boeing_747

The 747 is a descendant of the 707, which took 3 years.

It’s based on the 367-80 prototype which took less than 2 years (they only built one 367-80).

The 787 isn’t really representative of a reasonable timeframe for an experienced company to design + build an airliner.

Re:United Airlines will buy 15 planes from Boom Supersonic by notahacker on Thursday June 03, 2021 @05:22PM (#27387527)
We don't live in the 1960s and tolerate 1960s accident rates any more. The 787 is much more representative of a reasonable timeframe for an experienced company to design and build a new airliner than anything that happened in the 1960s when there were minimal regulations and no competition.
Re:United Airlines will buy 15 planes from Boom Supersonic by nopzor on Thursday June 03, 2021 @06:03PM (#27387990)
the difference is not just the regulations and risk tolerance.

it's also a regression in skills, culture, accountability, and urgency.