Two Birds of a Feather - S3-E19
Revealing mistake: Sam takes off from Van Nuys on his Super Stearman. We'll see him in Waco do all sort of acrobatics...but when he is first shown in the air right after talking with Richard Roundtree, you get a glimpse of another cockpit where the real pilot is, strapped with the safety belt that pokes in frame. (00:20:30)