United miles do not post accurately
Just an observation/warning - United miles in premium classes do not post accurately on the A3 account. It happened to me before and than I just thought it was a fluke but now when it happen consistently is probably not.
Examples:
DCA - ORD
Miles according to United: 612
Miles according to WebFlyer: 610
Miles posting to A3 for travel in Y class (1.5 multiplier): 891 (= 594)
ORD - IAH
Miles according to United: 925
Miles according to WebFlyer: 926
Miles posting to A3 for travel in Y class (1.5 multiplier): 1400 (= 933)
Miles posting to A3 for travel in Y class on CO (no multiplier): 925
So sometimes it works for you, sometimes it works against you. The only problem it is not predictable.