My recent experience using plan B.
In EWR the agent had no idea what I was talking about. When the supervisor came over, I explained that I was a displaced business class passenger and therefore entitled to PR1 status on the wait list.
She told me PR1 is only for passengers that were actually confirmed in business class and that I never was so she could only give me PR2 status.
She claimed that she could get in trouble if I was given PR1.
Even after I told her to look up GG one standby ( Who told you about that ? she asked me) she didn't budge.
I didn't argue too much as I saw that I was number 1 on the wait list.
But I never cleared
On the return (from GRU-EWR) they couldn't help me at the checkin kiosk and sent me to the ticket counter.
After explaining that I should be given PR1 status (thats what they told me on the phone..... I said) lo and behold within 2 minutes I was on the top of the wait list of 18 people !
1 seat in business opened up and I sat in the front of the plane