Can I Change My United Flight and Get a Refund?

https://www.devex.com/people/como-llamar-a-american-airlines-en-mexico-telefono-2138103

https://support.google.com/assistant/thread/311348913?hl=en&sjid=7939760561269369785-NA

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https://www.devex.com/people/airlines-can-i-change-my-lufthansa-flight-to-less-than-24-hours-2138671

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