TG's 744 (which would be doing BKK-LHR) Y pitch is very very decent... 33" or so IIRC. Comfy nice seats and good food. Much nicer than the LH cattle car experience. If you have to fly Y, I'd go TG on this route.

(Also, as a UA member I'd avoid LH as you'd only get 50% mileage for BKK-FRA...)

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RichardMEL, UA 1K
A Star Alliance Member.
* * *
Ansett Australia: In memory of "One of the world's great airlines"
Feb 17, 1936 - March 4, 2002. R.I.P