American Airlines isn’t operating as many flights as it used to. They’ve downsized their Phoenix flight attendant base as well. US Airways needed a large contingent out of Phoenix before merging with American, because it was the airline’s only hub west of Charlotte. That’s no longer the case.
Many flight attendants who weren’t furloughed back in the fall have transferred to other cities. Those that remain are only getting assigned to flight schedules right now, versus working reserve, if they’ve been with the company for fifty years. You’d need a start date in the summer of 1971 to avoid working reserve right now.