In a case where I own an aircraft... what? They can force me to take charcoal? LOL
Way to avoid the issue, Vec.
Core problem: A child right before birth is no different from a child right after birth, so endangering a viable child must be on the same moral and juristic level as endangering an infant, i.e. a fully grown person - because you don't want to go the Peter Singer "Infanticide is totally moral" route.
I don't see what's wrong with Grizzly's examples, even if they're a bit forced: The choice between mother and late-term (nobody's talking about the first three months here) child is the same as between any other two people, with the added 'Matroshka' difficulty. But engaging in unnecessarily risky behaviour and killing the child in the process should certainly count as negligent manslaughter or whatever the English term is.
How about this as a rough guide:
1-3 months: We're certain this is not a person. Abortions etc. are fine.
3-6 months: We don't really know if it's a person, so we'll err on the side of caution. No abortions, but the fetus isn't counted as a whole person when pitted against the mother.
6-9 months: It's a person now, and thus has equal rights to the mother. When having to choose between mother and child, it's probably still sensible to give slightly more weight to the mother's well-being.
Do note that I know next to nothing about the finer details of gestation, so the exact times (especially regarding the last trimester) could be off. There's still some points left: What about alcohol during the first trimester? There isn't a person yet who can be harmed, but there will be in the future, unless an abortion takes place. There's probably analogous situations for which there's already precedent, though.