I see that this thread is a couple years old, but it addresses (in part) a question I have.

I am somewhat new to the idea of frequent flyer programs. I do have a Delta Skymiles account, but it has no miles in it, as I have not flown often until recently. In the past month and a half I have taken the following trips:

11/18 San Francisco to Minneapolis with stopover in Phoenix (U.S. Airways)
11/22 Minneapolis to Washington DC with stopover in Philadelphia (U.S. Airways)
12/2 Washington DC to Los Angeles with stopover in Philadelphia (U.S. Airways)
12/4 Los Angeles to London (Air New Zealand)
12/12 London to Barcelona (British Airways)
12/18 Barcelona to Casablanca (Royal Air du Morac)
12/22 Casablanca to Cairo with unplanned stop in Sharm el-Sheikh (Egypt Air)
12/28 Cairo to Istanbul (Turkish Airlines)
1/1 Istanbul to Athens (Aegean Air)

Tomorrow, January 5, 2011, I am flying from Athens to Prague, on Malev Hungarian Airlines. I have not yet bought this ticket, but will do so shortly.

My question is-- if I sign up for a frequent flyer program, is there any way to get credit for some or all of the trips I have recently taken? I know some of the airlines are part of the Star Alliance, others are part of other programs. I have searched online, and throughout this site, but have not found any definitive answers.

Perhaps some experienced user can offer me some advice as to what mileage program(s) would be best for me, and what (if anything) I can do to gain credit for all those recent trips.