ORD-NRT-ORD in F
I went to Japan the end of July and returned in early August. I found the cabin to be absolutely miserably hot on both flights. I was hot to the point of sweating. The tempur-pedic mattress pads (which tend to hold heat anyway) made the problem worse. I finally had the FA collect it and just used the chair. On the return, they kept wanting to make my bed up, but I declined. It was simply to warm for the mattress pad. Even though the food and service was absolutely amazing on JAL, in the future I will probably stick with AA.