From a system optimisation perspective, SSTs solved the wrong problem.

Want to save people time flying? Solve the grotesque inefficiency pit that is airport transit and check-in.

Like, I'm sorry, STILL no high speed, direct to terminal rail at JFK, LAX and a dozen other major international airports? And that's before we get to the absolute joke of "border security" and luggage check-in.

Sure, supersonic afterburning engines are dope. But it's like some 10GHz single-core CPU that pulls 1.2kW out of the wall. Like it or not, an iPhone 16 delivers far more compute utility in far more scenarios.