Originally Posted by
ua_to_ord
Be aware that US, as far as I know, does not offer free standby for United 1Ks; thus, to take advantage of the flexibility of standby, you'll have to pay a fee in the neighborhood of $50-75.
This is a good point. In my experience as a UA 1K, US does *not* offer free standby (except during IRROPS). The DCA-BOS shuttle runs hourly so jumping on an earlier flight is often desirable. The standby fee is currently $50 (I paid it about 1 month ago).