The entire industry is at risk.

But when profits plummet, go to zero or become billion dollar losses, its really hard to get rid of existing profit sharing. Its really hard for them to even ask to reduce it, and its as close to immunity as you can get in 1113 because no company will ever "need" to reduce an expense that doesn't exist and will only exist if profitable. IOW as long as we don't reduce it in good times it will stay forever, and the instant profits return it will start paying out again immediately, even if a future hostile management team decides to milk it for a few years with an anti labor NMB.

In that respect, PS is far less at risk over the long term than any equal raise we could get for it.