They don't have an engine for a plane that they have yet to fly, for a concept that has limited commercial viability in the first place. We will look at companies like United and American Airlines that signed letters of intent to purchase these as foolish idiots.
In the day and age of remote meetings, there is nearly no alpha in being able to be in London three hours earlier from NYC. You would simply hop on a Zoom call if it were that urgent. Nobody is going to pay up for the cost if they are flying for leisure. There are limited viable routes in in the first place.