Aircraft hit by mystery object* at 30K feet...

[Butch]

Although not much of a mystery anymore, it seems to have been part of a weather balloon. 

https://www.vice.com/en/article/pilot-injured-after-mystery-object-from-space-smashes-into-commercial-plane/

And..

https://arstechnica.com/space/2025/10/the-mystery-object-that-struck-a-plane-in-flight-it-was-probably-a-weather-balloon/

Although the company say their objects don't pose a threat, the state of that window probably says something different.

Fortunately the only hazard I encounter at 30,000 feet is trying to stifle a fart.

[coxyhog]

I seem to recall there have been instances of high flying birds getting caught in an updraught & freezing.