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With an increase in the use of Unmanned Aircraft Systems (UAS) and the inevitable integration of UAS in every imaginable industry, there is a need for enhanced situational awareness and information sharing. Traditional approaches are not sufficient for UAS as they are typically designed for human involvement in the decision-making process. Novel solutions based on variety of sensors are being developed for object detection and avoidance. This paper presents UAS-to-UAS (U2U) communication as a means to enhancing situational awareness and safety in the airspace. U2U communication is essential for enabling UAS to operate cooperatively, avoid collisions, and respond to dynamic scenarios in the airspace. As airspace is a shared resource regulated by federal agencies, such as the Federal Aviation Administration (FAA) in the United States, certain questions, such as which aircraft has the right of way, need to be addressed unambiguously. This paper focuses on the philosophy of U2U communications using the five use-case scenarios proposed by standard organizations. The outcome of this research serves as a potential input and guidance for regulatory agencies.