<<wondering, at first glance, this seems like a bird strike limitation. Umm, birds don't fly above 10,000 feet do they?>>
Well if it wasn't a bird, I'd love to know what I hit in a 737 north of Naples at 250kts/11,000'! I recall from long ago, a 727 (Andes?) hit a large bird which came in through the radome and might have killed the copilot- certainly messed up the cockpit, and that was up at 30,000'+