To be quite blunt: if a bird of 8lb goes into your engine you're ok, if a bird of 9lb goes into your engine there's no guarantee. If the bird's bigger brother goes down the other engine then you're in the realms of statistical probabilities and prayer.
So let's get to details and look at 33.76 regarding bird strike. The rules regarding what an aircraft engine should be able to ingest are enlightening: even the largest engines are only certified safe to fly after ingesting a bird of 8lb. This is a lot less than a person (that was a ridiculous example from the GP; ingesting a person would destroy an engine). Birds are obviously a lot more easily ingested than a carbon-fibre and steel drone.
Any reasonably large drone would have enough mass to endanger a civil airliner and you're just playing the numbers until one is brought down with three to four hundred deaths.
What I know now is that I would have been happier and/or richer being either:
(a) a banker, or
(b) a programmer.
Most of engineering is very, very dull indeed.
The situation is very simple: The probability of all life being extinguished on Earth in the next 2 ish billion years is 100%. If we want to survive beyond that we need to get off planet. Earh is 4.5 billion year old. Talk of cost is ridiculous: I can fly from UK to US for less than one day's wages (on a good day) and I'm just a regular guy. 500 years ago it took the lifetime's savings of a wealthy man to make the same journey. It is ALL about energy. Once we have a reliable means of providing it on a sun-scale then we can do anything we want. We evolved to an understanding of relativity and quantum mechanics in a few million years, why the hell shouldn't we make a few more steps, given the same time again?
Now that we're discussing hydrogen, electric is conventional I think that shows where this is heading.