Which is NOT a form of communication technology used to receive pre-departure clearances?

The option indicating that email communication is not a form of communication technology used to receive pre-departure clearances is accurate. Pre-departure clearances are typically received through more immediate and technologically integrated systems that facilitate direct communication between aircraft and air traffic control.

HF radio is a long-standing technology used for voice communication, especially in long-range flights over oceans and remote areas. ACARS (Aircraft Communications Addressing and Reporting System) and datalink are modern systems designed specifically for the aviation industry to enable the exchange of messages, including clearances, flight plans, and other operational data. SMS messaging, while less common in a formal context, can also potentially be employed to communicate operational information swiftly.

In contrast, email communication is generally not used for receiving time-sensitive pre-departure clearances, as it lacks the immediacy and direct integration necessary for real-time flight operations. Therefore, the correct response accurately identifies a method that does not align with the critical, rapid demands of pre-departure communication.