There absolutely is a true up for the 824. Read the arbitrated agreement. As for the PP group, it actually is contractual but based on the transfer of Eagle aircraft at the time to AA. Everyone beyond the 824 and PP groups are straight contractual numbers.
What does this mean in the end for those of you who don't know? It means that the flow is strong and protected by contractual language. I know many are coming here for the flow and you can rest assured that there is language that protects you. Beyond that, AAG has wholeheartedly bought into the flow concept and fully endorses it. It was actually their idea to provide a total career option by coming to Envoy. Now, instead hiring at Brand X regional who flies for three different carriers, you hire on at Envoy for your AA career. After upgrading in around 2.5 years, you'll flow on to AA in under six for the career of a lifetime.
Don't let the naysayers here steer you away with false statements about the flow reducing or ending. As said above, it's contractual and AAG wants to see you succeed.