Is it a bird? Is it a plane? Yes. It’s a plane. But why has it got Homer Simpson’s face on it?It’s said that at any given moment, there are around 9,700 planes flying in the sky. Every so often, an airline will get their creative juices flowing and create an aircraft with such a fun airline livery that you’ll want to fly with them just to see it in person.We’ve compiled a list of the best themed airplanes from over the years that showcase the world’s most imaginative airlines.