How to fly on an airplane pregnant passengers?

Pregnant women are accepted for the flight:

if the pregnancy period does not exceed 35 weeks, if there is a medical certificate signed by a doctor no more than 7 days before the date of transportation;
if 2 children are expected to be born, the gestation period should not exceed 31 weeks on the date of transportation;
if the pregnancy period exceeds 32 weeks, then transportation is not allowed.

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