Hi all:

I frequently fly out of DCA and have been a US Airways FF member for years. However, I find myself occasionally flying out of IAD, or finding better fares on United or Delta.

My question is - between United and Delta, which one should I focus on as my supplemental program? I'm leaning towards Delta, but thought I would solicit some feedback. One bonus for Delta is I can apply for the Amex card - while I already have two Chase cards, so I'm not sure if United will let me have another.

OR - How many of you would dump US Air and go with Delta or United as my first tier program.

I don't fly enough for the elite levels, really just average around 30-40 segments or 40,000 miles a year.

Thanks!