Many fireworks are designed to explode at altitude. The biggest risk is probably if the firework is ingested into an engine (also a major risk for bird strikes).
Given the sheer quantity of energy that's already being continuously released in an engine would a small firework actually pose more danger than a bird? There's no bones in a firework after all.
Given the sheer quantity of energy that's already being continuously released in an engine would a small firework actually pose more danger than a bird? There's no bones in a firework after all.