One example of this is Los Angeles-Delhi. Probably possible with existing planes but would require cargo or passenger limits, which would make the route not profitable. No American airline is interested, given the connections available elsewhere, and Air India's (they've expressed interest in this pair before) habit of running routes at big losses will probably start to reduce now that they're privately owned. Airlines are perfectly happy to add more hops to your trip.
If there was a supersonic LAX-Singapore (I doubt India would allow supersonic planes), at least the longest leg of the trip is mostly over ocean, supersonic, and the Singapore-DEL flight is just a normal one.
Looks like United was running flights from SFO nonstop to Delhi until Russia closed their airspace to US flights. Looking at the list of longest nonstops, a hypothetical LA-Delhi, assuming usage of Russian airspace, flight would fit within the range of a couple of aircraft.
The JFK-Singapore direct would still be hundreds of km longer.
LAX-SIN is still more than 2x the best projected range of this plane.... Flying supersonic really guzzles gas, you're carrying gas to carry gas. Maybe if Boom added mid air refueling... but they'd have to slow down for an hour to do it.
If there was a supersonic LAX-Singapore (I doubt India would allow supersonic planes), at least the longest leg of the trip is mostly over ocean, supersonic, and the Singapore-DEL flight is just a normal one.
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