That delta sounds exaggerated. As I recall, the Concorde was some premium (like 30%) over first class. Which was clearly a significant premium over coach. But 30x for a reasonable comparison seems very large. I can certainly believe a typical economy ticket being 2K in today's dollars given that it's often close to $1K now.

(Yes, you can find cheaper flight but that's a pretty typical airfare on a major carrier today.)