There's really not much point in having a big debate over PBS. If I managed to make a compelling enough argument that you threw up your hands and said, "JW, you're right - I wish we had line bidding back at AA", you're still going to have PBS at the end of the day. I just feel the need to point out that you really should caveat your positive comments about PBS and limit them to what you guys have successfully negotiated at AA. PBS in the industry is just as widely varied as all the other aspects of individual airline contracts. It's not accurate to say "PBS is great" without putting some qualifiers with that statement. According to you (maybe you can help to quantify your opinion with a seniority hack), AA pilots have done a bang-up job creating an awesome PBS. If the majority of pilots there share your viewpoint, good on you guys. Not every airline with PBS can make that claim.
So, I continue not to try to sway your opinion, but to add some balance to the discussion and possibly offer new guys who are or eventually find themselves at a line bidding airline a differing perspective.
I disagree that most arguments against it are based on misunderstanding or contractual issues. Maybe that's true at AA. But, you can't evaluate it across the industry in a vacuum simply based on it's own merits. Your only experience with it is at AA and according to you it's good. If you wanted to refute arguments against it at another airline, you would need to evaluate it's impact on the complete system in place at that airline - not just what schedules pilots end up with each month.
One thing that kind of makes this an apples to oranges discussion is the significant variation in trip constructions at FedEx and UPS when compared to pax carriers. I would say that PBS is more suited to a pax airline. The concept of a "dream schedule" is probably only limited by one's imagination at AA. At FedEx, everyone's dreams (on a particular) aircraft fall into very similar patterns. So, it's very easy to build lines people want. Domestically, we basically work Mon-Fri, sometimes Sat. No one wants to work nights in a shotgun fashion, so we work week-on/week-off and so on. With a huge population of commuters (70%-ish), that works great - less commutes each month. Same for international. We have huge trips. Lots of them. Most pilots either work one 12-14 day trip or two smaller trips each month. There are a smaller number of lines for locals who prefer a higher number of shorter trips in a month. My point is, PBS generated lines according to individual pilot's desires would most likely look like they do now being built by our own pilots on the scheduling group. So, with all the negatives that come with PBS, we really have no reason to accept it.
I don't know about AA, but here, no contractual changes are going to generate the same level of QOL improvement that we can by conflict bidding. Our contract already exceeds the FARs in every area. The "shortcomings" (as you call them) of line bidding create opportunities for more pilots across a larger seniority range to be able to manipulate their schedules - BEFORE trip trading, dropping, picking up trips is an option. As I emphasized by bolding your statements above, PBS is strictly seniority based which you accurately acknowledged and is a HUGE factor when evaluating the reality of PBS. There's something to be said for the "So, you're saying I've got a chance!" potential even if it's occasional as opposed to knowing, without a doubt, you're only going to get what your 93% seniority can hold.
A final point - Airline management wants PBS.....badly. That should tell you something in and of itself. Many airlines that use PBS had it forced on them via bankruptcy contracts they had little to no choice in voting for. At FedEx, we continue to counter management's efforts to introduce PBS into our contract negotiations. We do that, not because we don't understand PBS - but because we do. In our case, it's not worth the cost in: pilots on our seniority list, time off during our vacation months, schedule flexibility for all especially junior pilots and having to waste negotiating capital to fend off attempts to enhance efficiency on the PBS scheduling algorithm every contract cycle just to get schedules similar to the ones we already get now.