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In my opinion, it’s unreasonable for a company to expect you travel for 40 hours in Y and then be functional at the other end. Not even willing to pay for Premium Economy?? That's not only unfair on you, but counterproductive, as it would have to adversely affect your performance. Maybe it depends what you're expected to do, but for example my last trip was 7 cities in 3 different continents within 10 days, and on 2 different occasions I had to go to meetings within a few hours of landing. I literally don't think I could have done that if I wasn't able to get some proper sleep on board, and seriously, I would just have refused to go on the trip if they weren't willing to pay for J. . . .