After playing a bit with my HackRF, I managed to receive some stuff.
Every day or so, balloons called “radiosondes” are launched, and I can actually receive those.
The payload you see below contains position data, battery status, altitude, and a bunch of other stuff.
If you’re curious about receiving those, there is a website tracking those, their TX frequency and all the data.

Airband is used by planes to communicate with the ground. Given I live near the Helsinki airport, I’m in a prime location to receive those properly.
For instance, here is small compilation of recordings:
Do note listening to airband might be illegal in some countries, for instance, Germany or North Korea. Always check your local laws (though unenforceable).
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