I’ve done it twice in recent times, as soon as to New Zealand and once to London, each times at someone else’s expense. The main advantage was a seat comfortable enough to sleep in, absolutely horizontal in the case of the long flight to New Zealand, reclined in the case of the shorter London flight. I may think about paying 100 dollars or so for that, plus just a little extra for dinner, drinks, an electric socket at my seat to maintain my laptop computer charged, and further attention—maybe as much as two hundred dollars each way, four hundred for the spherical trip. I now not keep in mind what the associated fee was for the flight to New Zealand, but I am fairly certain the difference between business class and tourist was significantly greater than that. The London flight was more moderen—I’m currently on it—and the difference was about …