What color is the light for customer calls?

The light for customer calls is blue, which is used universally within United Airlines to signify the presence of an incoming customer inquiry. This color is chosen for its visibility and to differentiate it from other operational indicators within the workplace, promoting a quick response from staff. The blue light helps create a standard communication protocol across various departments, ensuring that employees can easily recognize when there is a need for attention from customers. This consistent color coding helps streamline operations and improve customer service efficiency.

The other colors do not represent customer calls; instead, they may have different meanings associated with other operational alerts or notifications within the company's standard operating procedures.