I'll be doing a lot of IAH flying and would like to concentrate mile accumulation with one airline... most flights are for business; but I would like to ultimately use miles for pleasure. Is it the general consensus of the FT gurus that focusing on paticular airline for specific cities - like, CO for IAH or DL for ATL always makes the most sense when considering a loyalty program? What factors besides flying in and out of an airline's home base should be considered when choosing a FF program? Thanks in advance.