  By serving as an analog to traffic signal lights, communication signaling for
drone to drone communications holds the key to the success of advanced air
mobility (AAM) in both urban and rural settings. Deployment of AAM applications
such as air taxis and air ambulances, especially at large-scale, requires a
reliable channel for a point-to-point and broadcast communication between two
or more aircraft. Achieving such high reliability, in a highly mobile
environment, requires communication systems designed for agility and
efficiency. This paper presents the foundations for establishing and
maintaining a reliable communication channel among multiple aircraft in unique
AAM settings. Subsequently, it presents concepts and results on wireless
coverage and mobility for AAM services using cellular networks as a ground
network infrastructure. Finally, we analyze the wireless localization
performance at 3D AAM corridors when cellular networks are utilized,
considering different corridor heights and base station densities. We highlight
future research directions and open problems to improve wireless coverage and
localization throughout the manuscript.
