 The episode "Groundloop at Spanish Wells" features a 1918 Standard J-1 airplane (though it's called a Curtiss Jenny in the script) that had recently been restored in Tucson (where the episode was filmed) by Charles Klessig of Fargo, North Dakota.A later episode featuring the same pilot character, "The Return of Esteban", featured a 1929 British de Havilland DH.60 Moth biplane.According to Klessig, the episode was filmed in New Mexico where the higher altitudes precluded the use of the older aircraft.