This song is among the best in the Tame Impala catalogue, for the reason of simulating a flight via music and the experience of Kevin Parker, who hates the very notion of flights.
The very music slowly picks up and gets more intense. In a jarring part towards the beginning, the drums begin to rattle like thunder and is likely trying to simulate the movement of the plane right before take off. The very name of the song simulates the various stages of flight: "Runway, Houses, City, Clouds."
The music continues to rise and rise and you get a sense of increased anxiety. Parker also is in additional emotional turmoil, speaking of taking off but being left behind. The music slows and about the three quarters mark, it finally goes into full psychedelia. I like to imagine Kevin finally asleep while the plane glides through the clouds, his thoughts rattling in his head, both good and bad.