The shortest flight I could find in a quick search is about 29 hours. There are many other options at 21-23 hours. A US flight is also 3,000+ miles longer. The longer flight results in higher costs, so a higher price given the same target margin, plus an extra 6-8 hours flying time. I don't see a market for that type of a ticket. I suspect that all that competition didn't exist 10+ years ago.

Thai, Singapore, Emirates, Cathay - why would I pay more and travel longer on the product offered by a US airline vs. these.