Which routes are growing? I recall around the time that OpenSkies died the number of routes with business class-only planes appeared to be shrinking quite a bit. I don’t doubt your claim per se but would like to see some support for it.
In general, it's hard to fill a plane full of paying business class customers. (In a typical business class compartment, a lot of those seats are being filled with upgrades of one sort or another.)
At least a couple business class-only airlines didn't last long. The only current route I'm aware of is the BA London City to NYC route. Though there may well be others in the Middle East, etc.
I know Swiss and Singapore used to have them but I think both may have since been eliminated. I don’t think any US carriers do unless United has one and I’m pretty sure BA doesn’t anymore now that OpenSkies is gone, so that doesn’t leave many obvious contenders. Thai? LH?
