The virus can stay suspended in air particles because it typically gets there in bubbles of water that are warm and small enough not to land. On clean, dry surfaces, it dries out quickly and dies. On copper and copper alloy surfaces (most sanitary surfaces like drinking fountains and public bathroom sinks around here) it dies instantly.
Also in the air, it often gets picked up and quickly redistributed, whereas on surfaces, it stays on surfaces unless someone aerosolizes it.
Hence why surface transmission is not an issue, but air-to-air can be depending on the environment. Air-to-air transmission where lots of people share moist, room temperature air (eg. shared heating ducts) is the primary vector at this point for the virus besides direct transmission from person to person. Hence why lockdowns of parks and beaches and outside dining are counterproductive, because they force people inside.
If you are vaccinated, you have nothing to worry about, if you're under the age of 35, you have nothing to worry about, if you share a room with vaccinated, you have nothing to worry about. If you're between the ages of 35 and 65 you have a minor risk of getting non-life threatening sickness. If you are otherwise immunocompromised, your mileage may vary. If you're over the age of 80, you will die soon anyways, but you should be careful.