This airplane stamp is the West Coast half of our bi-coastal series of United States airmail stamps (for the East Coast version, see Liberty Air). Hopefully in reality the planes fly a little higher! The San Francisco - Oakland Bay Bridge opened six months after the Golden Gate Bridge. It is a suspension bridge that carries over 270,000 cars a day. I can only imagine how difficult it used to be to get around San Francisco. You'll love this airplane t-shirt.