I'm not sure what point you are making, but you are correct.
The legal and contractual structure of their plan is somewhat different than ours but its still basically the same thing. It's "at risk" compensation that varies with the company's profits.

The pilots participate in the corporate plan on the same basis as all other employees. Its a deeply ingrained part of their vaunted "culture" over there but yes, the corporation could theoretically end the plan if they wish.
If they do that however, the pilots have contractual protection. It would trigger an immediate reopening of the pilot contract to negotiate a "replacement" plan.

Their plan is also significantly more detailed and complex than ours.
Depending on individual tax circumstances, in some respects its a lot better.
Its geared more toward retirement savings rather than annual cash compensation.

Here's the Southwest plan:
Warning --> it will put you to sleep.

Southwest Airlines Co. ProfitSharing Plan