Trying to plan a semi-complicated trip for end of July/early August. I am trying to determine how best to leverage miles. Maybe this will be an interesting puzzle for you mileage geniuses. Overall routing is PIT-IAD-LHR-SIN-SFO-PIT. The components are that: 1) I'm flying r/t PIT. 2) I need to spend one overnight near LHR (would like the daytime flight IAD-LHR). 3) I want to fly the following day via A380 (SQ) LHR-SIN if possible, in business class. 4) Would be nice for SIN-SFO to be in C too. 5) I could go SFO-PIT via IAD, if that made it cheaper (e.g., could buy a separate PIT-IAD r/t ticket for first and last legs) Also: I am UA 1K. I have about 304k award miles. I have 4 GPUs. Would be great to minimize $ cost, but am willing to upgrade by miles alone, or miles + money. But will not pay outright for a C class ticket for any portion. Also, would trade off the A380 trip for a LH or other set of flights from LHR-SIN. Dates are: Jul 30 PIT-IAD-LHR Jul 31 LHR-SIN Aug 10 or 11 SIN-SFO Aug 13 SFO-PIT I looked at a RTW fare on the *A website (about $5k), as well as award travel from UA's web site. Thanks!