In the Vaikuṇṭhas there are airplanes, but they make no tumultuous sounds. Material airplanes are not at all safe: they can fall down and crash at any time, for matter is imperfect in every respect. In the spiritual sky, however, the airplanes are also spiritual, and they are spiritually brilliant and bright. These airplanes do not fly business executives, politicians or planning commissions as passengers, nor do they carry cargo or postal bags, for these are all unknown there. These planes are for pleasure trips only, and the residents of Vaikuṇṭha fly in them with their heavenly, beautiful, fairylike consorts. Therefore these airplanes, full of residents of Vaikuṇṭha, both male and female, increase the beauty of the spiritual sky. We cannot imagine how beautiful they are, but their beauty may be compared to the clouds in the sky accompanied by silver branches of electric lightning. The spiritual sky of Vaikuṇṭhaloka is always decorated in this way.
Ref >> Srila Prabhupada Vani.