The APA got themselves in a bit of a bind (as they always do, because they’re wildly reckless and incompetent). They realized that there was no possible deal that could be reached that the members would vote for because they had made the mistake of whipping them into too much of a frenzy. They were on the path to an unwinnable strike. They called Bruce Lindsey, Clinton‘s Deputy White House Counsel, and told him that things sure would be a lot easier if the President would issue a PEB, because if a third party was involved and told the pilots they were asking for too much, they might actually convince the rank and file to take a reasonable deal. Clinton dutifully obliged.
This sort of situation is exactly why
@BobDDuck was talking about the dangers of releasing aggressive openers. It can create a situation that it is hard for union leaders to keep under control.