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U-FLY Alliance
5 member airlines · Official site
Based in China and founded in 2016, the U-FLY Alliance is the first alliance to be formed exclusively by low-cost carriers. This alliance was formed to help small, regional LCCs grow without merging multiple airlines into one, maintaining a local identity in each airline's province in China.
The Seatlink take
You'll likely not come across this alliance unless flying regional routes in China, Hong Kong, or South Korea, but if you happen to be based in one of these countries then U-FLY will serve your LCC needs well.