The cats with the airplanes are among my favorites --they refer to visits to or from Grandmother (she would fly to North Carolina or we would fly to Indiana)
The Alfred Mainzer Company has published these cards for 50-60 years. These funny cats are drawn by European artist Eugen Hartung. The images were popular and used on postcards which are still sold today. They are usually called Mainzer Cats after the name of the publisher.