[FabHK]

Yes, so if time of birth is uniformly random (haha) across the final month, then, assuming the flight took, say, half a day, you'd still have to multiply by 0.5/30, so have only ~0.05 expected child births. Still surprising, in other words. Good chance pregnant women were prioritised.

[tzs]

It was also probably a stressful and frightening flight. A lot of people believe that this can increase the chances that a woman will go into labor [1], although a quick round of Googling didn't turn up anything convincing on whether or not that is true or just a myth.

[1] https://www.youtube.com/watch?v=RyRrz9Soutw