DOS Air: All the passengers go out onto the runway, grab hold of the plane, push it until it gets in the air, hop on, and jump off when it hits the ground again. Then they grab the plane again, push it back into the air, hop on, etcetera.
Windows Airlines: The terminal is very neat and clean, the attendants are all very attractive and the pilots very capable. The fleet is immense. Your jet takes off without a hitch, pushing above the clouds, and at 20,000 feet it explodes without warning.
Mac Airways: Tickets are expensive. The cashiers, flight attendants, and pilots all look the same, feel the same and act the same. When asked questions about the flight they reply that you don't want to know, don't need to know, and would you please return to your seat and watch the movie.
Linux Express: Each passenger brings a piece of the airplane and a box of tools to the airport. They gather on the tarmac, arguing constantly about what kind of plane they want to build and how to put it together. Eventually, they build several different aircraft, but give them all the same name. Some passengers actually reach their destinations. All passengers believe they got there.