Hi I work in a real international airport and I wanted to suggest an idea.
In most airport’s, badge color describes the role of the person wearing it without having to study the details on it.
I have attached a photo for you to see your own badge also.
However I would change the badge colors to the following to be more realistic.
RED - Security, Ramp Agents (Anyone working airside out on the apron or airfield).
Blue - Franchise staff, janitors, (Anyone working airside that does not go onto the apron or airfield).
White - Airport Staff working landside (Any staff that do not go through security onto airside).
Orange - Contractors