No, you cannot physically "touch" a cloud from a plane in the way you would touch a solid object, because clouds are composed of trillions of tiny water droplets or ice crystals suspended in the air. When a plane flies through a cloud, you are technically "inside" it, but the experience is more akin to being in a very dense fog. If you could reach out the window (which you can't due to the pressurized cabin), it would feel damp and cool, like a light mist, rather than fluffy or cotton-like. These droplets are so small—averaging about 20 microns—that they lack the surface tension to feel like a "thing." In 2026, while we often see high-altitude "cirrus" clouds that look solid and wispy, they are actually made of ice crystals that would feel like a fine, frozen dust if you could touch them. The closest most people will ever get to "touching" a cloud is walking through a low-hanging fog on a mountainside, which is physically identical to being in an airborne cloud.