"one who works for less than union wages or on nonunion terms"
Skywest pilots are non-union and you could probably find some union airline that makes more than them. Does that make Omar a scab? Sure he'll be glad to hear that.
Despite Webster, the defination of a scab, in the airline biz, is one who crosses a union picket line during a strike. We really shouldn't mess with that. The Freedom guys weren't scabs, the Gulfstream guys aren't scabs, and the Gojet guys aren't scabs. All these help lead the race to the bottom, but calling them scabs is inaccurate.