Originally Posted by UAX@SFO
In response to the OP - if your original flight was cancelled, and you were on standby as a BP5B (other revenue standby), you would be entitled to a BP5A (disserviced passenger) standby priority upgrade, but you would have to make contact with an airport CSR to make this change.
And this works for even a flight that is technically earlier than the canceled one? Often when there are delays, the sequence of flights can get messed up as well.
PS We may have met last summer - flew a couple of SkyWest flights in and out of SFO. Liked the airline so much, I bought 0.0001% of the company.