United is launching new 'fifth freedom' flights. Here's how the rare international routes work and why airlines love them.

United is launching new 'fifth freedom' flights. Here's how the rare international routes work and why airlines love them.

Nicolas Economou/NurPhoto via Getty Images

A United Airlines flight from Tokyo to Mongolia? Or Emirates from Mexico City to Barcelona? These routes might seem weird, but are a unique byproduct of decades of globalization and airline evolution — and are especially popular with airline nerds.

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