Splitting again this year. There's enough uncertainty, doubt, and things that are being left unsaid in both of the FF programs I participate in, that I don't feel comfortable giving all of my business to any one of them this year.

I fly what ever makes the most sense, price and logistics wise, between the two.

My business trip last week had 2 flights on Delta, 1 on United, and 2 on USAir (credited to MP)

My trip next week is on United, because Delta was too expensive, but the trip the following week is back on Delta due to ease of schedule.