VainGlorious writes:

How long, do you suppose, those £1600 seats will retain their value?
The pricey seats pay for the flight. Everyone else just about covers
their share of the fuel costs.

Not true for transatlantic flights. Often the cargo alone covers the entire
cost of the flight, and the passengers are pure profit, even in economy class.
That's how BA can afford to fly empty aircraft (empty of passengers, that is).