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

Source: Business Insider

United is capitalizing on the trend of using 'fifth freedom' flights to generate revenue and connect to further-away places. Nicolas Economou/NurPhoto via Getty ImagesAn international agreement allows airlines to fly between two countries other than their home country. The strategy can boost revenue, aircraft utilization, and market connectivity.