Cat dream (kind of)
I was visiting a childhood friend from school. We were middle school age. He lived in an absurdly large house that was more like an office building. But somehow it was clear we were now grown up and had not seen each other in years. I asked him if he still had cats (he never had cats). He said sure. A fluffy Persian cat came and laid down on his lap as we were sitting on stairs. The cat purred loudly. I remarked it sounded much like a passenger plane warming up its engines. Indeed it did.
The cat got up, walked away still purring and the purring faded away as the cat left. It returned shortly after and the purring got louder before fading again. The alarm clock ripped me out of the dream and I noticed noise from landing airplanes outside. That's rare, but they must have temporarily shifted the flight corridor somehow as one jet was landing after the other - with exactly that noise the cat had made.
Weird how he brain interprets real life noises in dreams.