At what point are flights Cancelled?

Airlines cancel flights They don't have an aircraft available for the flight. This can happen when the aircraft is scheduled to be fixed after an issue is identified. More commonly, passengers can be left without a plane in the case of "rotational delays".

Do you have to be vaccinated to fly Delta?

Travelers from the US must provide proof of vaccinations at the time of boarding. . This can either be digital or paper and must include at a minimum full name and date of birth matching the traveler's passport, name of official source issuing the vaccine, vaccine type and date(s) of vaccination.