https://support.google.com/edu/classroom/thread/330115285?hl=en&sjid=2951079157144212110-NC

https://www.steadyhealth.com/topics/how-to-access-live-customer-support-at-delta-airlines

https://support.google.com/edu/classroom/thread/330113733?hl=en&sjid=2951079157144212110-NC

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https://support.google.com/edu/classroom/thread/330114429?hl=en&sjid=2951079157144212110-NC

https://www.steadyhealth.com/topics/steps-for-effectively-speaking-with-a-live-agent-at-delta-airlines

https://support.google.com/admanager/thread/330110672?hl=en&sjid=10992816169556150534-NA

https://support.google.com/edu/classroom/thread/330111665?hl=en&sjid=2951079157144212110-NC

https://www.goodreads.com/quotes/12637314-desde-m-xico-c-mo-llamar-a-latam-desde-m-xico-para-hablar-directamente-con

https://www.steadyhealth.com/topics/steps-to-reach-a-live-agent-at-united-airlines