Being a foreign passenger made multiple searches to know
How do I talk to a live person at Delta? on forum websites as you have several queries in mind Does Delta airlines require you to be fully vaccinated to fly? ,Do I have to show proof of vaccination to fly?,What if I have tested positive for COVID-19 antibodies or have recently recovered from COVID-19?, Do I still need proof of vaccination submit to officials before boarding? So not to worry here we have provided guided information which makes help a passenger to get complete assistance
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https://www.smartcatches.com/blog/how-do-i-speak-to-someone-at-delta