That there were airplanes flying in the sky long, long ago can be understood from this verse. Śrīmad-Bhāgavatam was spoken five thousand years ago, and the statements of this verse prove that the symptoms of a very advanced civilization then existed, even in the upper planetary systems, as well as in the lower planetary systems. Modern scientists and philosophers foolishly explain that there was no civilization prior to three thousand years ago, but the statement of this verse nullifies such whimsical judgments. The Vedic civilization existed millions and millions of years ago. It existed since the creation of this universe, and it included arrangements all over the universe with all the modern amenities and even more.