[rst]

The point of lie-flat seats is to let you doze off on long trips. The point of Concorde is that even trans-Atlantic trips weren't log enough for that to matter. You don't get lie-flat seats in first or business class on many US domestic flights either, for the same reasons.

[ghaff]

That’s starting to change though. United is reconfiguring a lot of their aircraft for Polaris seating even domestically. The seats are more comfortable though I agree it doesn’t make as big a difference on even long daytime flights.