Honestly it’s not as if step letters are handed out like candy. You have to step on your crank pretty bad to get one.

Second hand account: Pilot refuses an assignment (a junior man event on a day off) because he has paid for expensive tickets to a sporting event on said day. Is given a missed assignment. Company didn’t appreciate the pilot refusing to work on his day off, so they dig into his HI10 and see a few sick calls that weren’t “cleared”. Company retaliates by adding a letter to the pilots file for not clearing sick calls. Pilot could care less because he is protected, but just goes to show that a scenario like this could not be that far off for intimidation/or flow prevention for no-protected pilots.

How long are the attendance letters "active" in your file?

There’s not really a stated time frame it’s “active.” I’ve heard in some accounts a pilots been told to revisit to get it reviewed & removed in a year or two assuming no other issues arise.

Long prison sentence. Hope you get out sooner!

Step letters are active for 2 years o believe. Someone will be the sacrificial lamb next year. Gotta keep the pilot group in line.

Looks like it's 2 years ("No further discipline"), unless overturned by the grievance and/or System Board of Adjustment procedures. It's in your file for 5 years for PRIA purposes.
(Section 29 M.4)

so its in pria for 5 years, no place to go then. envoy will hold you until they desire for you to flow. welcome to aag.

Being in PRIA does not prevent you from flowing. An "active" letter (2 years) does.
ANY airline, by LAW, is required to keep every letter/training record for 5 years. That is not unique to AAG.
Welcome to FAA.

Most airlines aren't as quick to throw letters in your file as Envoy.