I don't think you quite understand the economic factors related to publicly-traded companies. You're quite right that without demand for a company's services, the value of employee labor declines. But investor demand for shares has quite literally zero effect on the value of a unit of labor. So if you're a Global Services customer riding on Skywest, you do indeed contribute to Skywest pilots' livelihoods. But if you simply hold shares? You contribute nothing at all. And don't say you're contributing capital for expansion. While that's often true in early-stage public companies, and is the reason nearly all companies go public in the first place, it doesn't apply to Skywest Inc, which has plenty of cash in the bank and no need to finance major growth.

All of that aside, the value of a unit of labor is utterly independent of the demand for shares in one company (or any company). The value of a unit of labor is simply determined by what buyers (in this case, airlines) are willing to pay for that labor. There are plenty of airlines who'd be more than happy to pay Skywest pilots as much or more than their current salaries. Again -- your demand for shares has quite literally no effect on the value of a pilot's hour of labour.