Retroactively named for the blend of Windows Vista/7's Aero theme, early iOS's glossy icons, and the humanist Frutiger-family sans-serif used in airport and hospital signage (the "Frutiger Aero" label itself was coined by nostalgic internet communities in the late 2010s). It runs on the bright optimism that technology would deliver a clean, eco-friendly future.
Visually: blue sky, green fields and water-droplet nature imagery; rounded buttons with glass-like specular highlights; and translucent panels using the then-cutting-edge blur and transparency effects. Type leans on humanist rounded sans-serifs like Frutiger and Segoe UI.
It faded under 2010s flat design and is being rediscovered in the 2020s with a "those days were more innocent" sentiment. It sits near Y2K and vaporwave, but unlike their cynical irony, Frutiger aero is sincerely optimistic.