7.  Radio Communication Procedures  Aviation has unique communication procedures that will be foreign to a remote pilot who has not  been exposed to “aviation language” previously. One of those is aircraft call signs. All aircraft that  are registered in the United States will have a unique registration number, or “N” number. For  example, N123AB, which would be pronounced in aviation terms by use of the phonetic alphabet as,  “November One-Two-Three-Alpha-Bravo.” In most cases, “November” will be replaced with either  the aircraft manufacturer’s name (make) and in some cases, the type of aircraft (model). Usually,  when the aircraft is a light general aviation (GA) aircraft, the manufacturer’s name will be used. In  this case, if N123AB is a Cessna 172, the call sign would be “Cessna, One-Two-Three-Alpha-Bravo.” If  the aircraft is a heavier GA aircraft, such as a turbo-prop, or turbo-jet, the aircraft’s model will be  used in the call sign. If N123AB is a Cessna Citation, the call sign would be stated as, “Citation, One- Two-Three-Alpha-Bravo.” Typically, airliners will use the name of their companies and their flight  number in their call signs. For example, Southwest Airlines flight 711, would be said as, “Southwest- Seven-One-One.” There are a few airlines such as British Airways who will not use the company  name in their call sign. For example, British Airways uses “Speedbird.” To close, a remote pilot is not expected to communicate with other aircraft in the vicinity of an  airport, and should not do so unless there is an emergency situation. However, in the interest of  safety in the NAS, it is important that a remote pilot understands the aviation language and the  types of aircraft that can be operating in the same area as a small UA.  Remote Pilot – Small Unmanned Aircraft Systems Study Guide  42