I stick with AA mostly and complement it with OneWorld premium fares. All purchased through my corporate travel agent (great deals!). For hotels, I also hold Amex Hilton Surpass and Chase IHG cards, so I will stay with both Hilton and IHG hotels mostly. The IHG card I don't even bother to use for my IHG stays as I get more points value from my CSR card. For Hiltons though, I prefer using Amex Surpass, as 12X Hilton points are hard to beat, even with a value of 0.5 cents/point.