[zimzam]

Having always flown economy I recently took advantage of a cheap, domestic upgrade to business class. I had to work while on the plane and I was noticeably more productive on the flight and less fatigued than I normally would be in economy. So I think there is an argument to be made for the following categories of trips to be a step above economy:

* when the traveller is expected to get work done on the flight * when the time at the destination is short (1-3 days) and is densely packed * when the traveller is moving immediately from flying to being productive on the ground

Otherwise after flying economy it would only take a good, relaxed meal and/or a 20 minute catnap to bring me to post-business class levels of productivity.