The airline industry seems particularly rough. I assume it's because of the high cost of just entering the business. I was on a United Express (ie - a carrier operating under United's name) flight once and sat next to a pilot. I was listening to him talk about their imminent strike and contract negotiations and it just seemed like a bummer. Basically, the minor carrier is only big enough to contract out to one major carrier, which is also all that's economically feasible since the crew need uniforms of the major airline and the plane can't be repainted with every flight to represent another carrier.
With their dependence on United established, United then failed to pay the minor carrier. This caused the minor carrier to go delinquent on bills, salaries, etc. United then agreed to immediately backpay everything if the minor carrier agreed to salary cuts across the board. If they didn't, then United would hold out paying until a court made them.
This is made all the more insulting because United, et al, ask these same pilots not to wear their uniforms when using their food stamps.