Jupiter is a part of a class of planets known as “gas giants.”
Jupiter, Saturn, Uranus, and Neptune all fall into this family (although the latter two are a part of a subgroup called “ice giants,”). These gas giants are much more massive than the rocky, terrestrial planets like the one we all live on. The differences between terrestrial planets and gas giants don’t end there; gas giants are made of mainly gas (hence the name) and not of solid materials. While they (probably) possess a small, rocky core, the vast majority of the planet is made of gas—in the case of Jupiter and Saturn, these gasses are mostly hydrogen and helium, which also happen to be the most abundant elements in our sun.
Because of Jupiter’s vast mass and gravitational field, the pressure increases drastically as you come down through the clouds. The upper cloud layers widen downward for about 1000 kilometres, at which point the pressures are enough to transmute hydrogen into a strange fluid that we call “liquid metallic hydrogen.” At these immense pressures, hydrogen starts to act like a metal. It is this ocean of metallic hydrogen that produces Jupiter’s almighty magnetic field.
At this changeover point, the atmospheric pressure approaches 200 Gigapascals (GPa). For comparison, standard atmospheric pressure at sea level on Earth is roughly 100,000 Pa. Simply put, the pressure at the “surface” of this sea of metallic hydrogen is more than a million times higher than that of Earth. If that isn’t enough to kill you, the temperature at this boundary is 17,500ºF (9,700ºC). This is well over the melting point of any element you’ll find on the periodic table.
Suffice it to say that conditions inside Jupiter’s atmosphere very quickly become aggressive.
Long story short: No. You would not be able to land on or fly through Jupiter.

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