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IMO, the legal network and a reputation of always suing airlines are the most important things in this line of business. For example, if you are seriously delayed while departing from an EU airport, you are entitled to a compensation. Inside the EU this mostly works, but consider the case when you live outside the EU and the non-EU airline basically tells you: "sue us". I'm currently using the services of one of their competitors to try and extract 250 euros from one small airline that thinks that because they're outside the EU they can delay a flight for two days and not pay the legal amount.