One episode called "Frankie and Ellie get lost". Franklin and Eleanor Sherman were on a plane on their way to a vacation.
The plane was crap due to the airline. What would you expect from an airline called "Hindenburg Airways"? Franklin went into the cabin to complain to the pilot, only to find the pilot was a penguin wearing a helmet, goggles and scarf. Also, he had been drinking. Then Franklin realizes that penguins can't fly and after he says that twice, the plane goes down in cartoon comical fashion.