Ultimately it comes down to the value of your time; as stated earlier on this thread, flying J or F means less recovery time than flying Y. For short trips that difference is a few hours, for half way around the world it can be a few days. On business trips I often arrive at 6 am and am at work at 9 am -- so paying thousands more for the airfare is cost effective, while not working for a day or 2 is not an option. For a leisure trip I can envision getting more value out of paying thousands on the ground