Chuck List, 41, lives in one silver aluminum tube, a 2005 International CCD Airstream, and works in another, a commercial airplane. List, a pilot for SkyWest Airlines, is living the Airstream adventure in a way few do: He works 16 to 18 days a month, usually four days at a time, flying around the country. Then he returns to his Airstream to continue his journey on the ground.