Originally Posted by
paul21
There are definitely codes in standby for confirmed F or displaced pax w/ F that are the highest priority. There are also upgrade priority codes for the same. You probably found a rare instance of someone who was coded correctly.
The code in question is, IINM, "FIRST", as displayed on the standby list in the first column ("BASIC ECONOMY", "MAIN CABIN", vs. the boarding zones in the last column.