[delecti]

There is: premium economy.

Also, business/first class is often much less than 5-6x the economy price. In fact I'm not sure I've ever seen it that much higher.

[hocuspocus]

On transcontinental flights 5-6x sounds about right. My last flights between Europe and North America or Asia were typically like

- Economy $500

- Premium eco $1500

- Business $3000

- First $6000

And the gap can be wider on high-end airlines (15-20k for a first class ticket).