alt Hacker NewsLook at a 777-300 on [United](https://www.united.com/en/us/fly/company/aircraft/boeing-777...) - 60/290 biz/econ (~20%), but the biz seats take up probably 40% of the plane.
Estimate 4k for one-way biz ticket and 500 for economy, then that's about 240k from the front and 145k from the back. Actually, I'd expect them to optimize based on space, so if 40% of the plane is biz, then 40% of revenue should come from biz. Perhaps the most profitable routes with this config are 60% revenue from biz; other routes might be more like 2.5k-3k one-way biz.
But biz will be half empty or more at full price, so it gets filled with upgrades of coach tickets to reward frequent fliers or full-fare users. The average has to be lower. The biz price may also be optimistic. United EWR-LHR is more like your $2.5k-$3k. Delta has an ATL-LHR option for first/business class with a bed that's more like $8k-$10k, and their Premium Select, which is more like United's business class, is $2.5k. Interestingly, they offer more beds than big seats.
I remember pricing out the Concorde years ago, before it was grounded. BA's first class subsonic was $8k, Concorde was $12k. (2001 dollars) If you're paying those rates anyway, it might be worth it to go faster, if you don't mind the relatively small seat and limited food service. Coach was $400-$600.