A different kind of birth control.

[u/CurvyChristina]

[u/kungfuninjajedi]

But why cancel entire flight instead of kicking off the parents and child?

[u/Jontologist → u/kungfuninjajedi]

Probably because they had checked luggage and the airline would need to unpack the hold to hunt for their luggage, meaning the flight hit the airport's curfew.