Martin 4-0-4 N40439 at San Francisco Mills Field before the new (current) terminal complex was opened to the south in August 1954. The old airline terminal is on the left center in the background. SFO was Mills Field until it became San Francisco International.

Still showing the very faded colours of its former owner Piedmont Airlines, and even its name "Mount Mitchell Pacemaker" can still be seen below the cockpit windows, also very faded. Piedmont used this old TWA aircraft (ex N40439) between 1965 and 1968. It passed through the hands of some brokers before ending up as a spares ship with PBA at Naples, FL in 1977. It was completely scrapped during the early 1990s.