My Three Sons (1960)

S2E20 Le Petit Stowaway

Steve is headed to Chicago for work, and he had promised Chip he could join him. However, plans shift unexpectedly, and Steve ends up on a military flight to Paris instead. Determined to accompany his father, Chip devises a plan and sneaks onto the plane. Once in Paris, he finds himself wandering alone and soon meets a kind-hearted little girl named Marie, who befriends him.