The concept is explained much better in the link, but TLDR: People are trying to organize and crowdfund the purchase of spirit airlines assets with the goal of running it as a worker owned business similar to winco or rei. Seems at least tangentially relevant to this community
From reading their website, it seems like they are advocating for a consumer cooperative rather than a worker cooperative, with the main difference being the consumers get voting rights as opposed to the workers, which is a very important distinction.
The employees would be granted an ESOP (Employee Stock Ownership Plan), which is great, but is not the same thing as the workers having complete and final control over the company they work for.
For public facing companies I kind of prefer this tbh. It also makes sense from a raising funds perspective (more owners to pay in). Employees should have voting rights and Coop or not, the union needs to exist to protect their interest too