I am doing this WT+ MFU to CW next month. I haven't done this route on BA yet on AA but a helpful tip for you is on the trip back (I mean to LA sorry I'm opposite of you) sleep on your flight. I'm sure you will be getting up in GLA early which at that time in LA it will still be the previous evening. There is an 8 hour time differnce which is a bit difficult to adjust if you have never done it. Anways, Have a good trip it will be a blast