1) IAH
2) IAH
3) IAH
4) E+ in theory; never had to use it, because ...
5) CPUs/M-B-ups (100%)
6) GPUs, especially gifting them to GM friends (100% success 2011-2013) and ability to use for LH F
7) Network
8) Global Services (helps with first part of #6 above, among other things)
9) GF (especially cheap buy-ups from C) and, as a result, GFL, *A F lounges and *A partner F lounges
10) Nostalgia for CO
11) MileagePlus generally (especially Saver frequently available)