It Happened at the World's Fair - S1.E36

Mike and Danny fly a cropduster, but because of Danny's gambling debts, a local sheriff takes custody of it. Trying to earn money, they hitch-hike to the World's Fair in Seattle and, while Danny tries to earn money playing poker, Mike takes care of a small girl whose father has disappeared. Being a ladies' man, he also finds the time to court a young nurse.