So, according to your definition, all union members are also serfs? They don't own anything nor do they have guaranteed rights to jobs or longevity. Case in point, the US airline industry.The word you are looking for isn't SCAB, its SERF (or SLAVE). A SERF works the land (sky in this case) for the wealthly land owner (management). The SERF isn't allowed to own the property on which he lives (XOJet employees have no guaranteed rights to jobs or longevity).
Bottom line, unless you own the sucker, there are no guarantees.