From a cost standpoint -- an AA upgrade to Biz is the best value.
DFW-LHR $440 coach tkt w/ 50,000 to upgrade to BIZ. Bets using 90k miles for a "free" tkt.
I admit though I am getting some good ideas reading some of these other postings.
Thanks.
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TANSTAAFL - but if you work it right, FF miles comes pretty close.