Dr. Kano, who was Japanese and known as the Founder of Modern Judo was first to devise many of the concepts that are the foundation of modern martial arts. Dr. Kano devised the colored belt system as a visible sign of a student's progress, awarding the first black belts in the 1880s.
The Airtrain (name based on the model file), also known as Aeroplane (name based on the texture file) or Air Train (name based on in-game name), is a passenger airplane that appears in Grand Theft Auto III, Grand Theft Auto: Vice City, Grand Theft Auto: Liberty City Stories, Grand Theft Auto: Vice City Stories and Grand Theft Auto: Chinatown Wars.
But, they all have the same purpose and operation. Airbags are supplemental restraints. Supplemental means they help another system, or they are secondary to another system. In this case it is the seat belt. Though later airbags are required to be able to, airbags are not meant to be used without a seat belt; in fact they can be very dangerous or even deadly without a seat belt.