Yeah I can see how it would be frustrating trying to apply a GPU if you had to fly on a particular day. My TPAC flights are usually for business (my TATLs are usually leisure) but because my work travels with me on my computer I have +- several days to choose for departure and return.

If necessary, we enjoy hanging out in Bangkok or Seoul or Singapore for a few days, and we'd rather pay the freight for several days at Raffles or Mandarin Oriental than to United for the 14 hour full fare experience. And my wife is completely flexible with schedule.