In the Aeronautical Information Publication, from the Australian Civil Aviation Authority, appears the following. Under the section: NATIONAL SECURITY REQUIREMENTS Subsection: Procedures for aircraft operating in an Air Defence Identification Zone Table: Radio Communication During Interception there is a phrase listed: HIJACK -- I have been hijacked. At the bottom of the table is Note 1: Note 1 -- Circumstances may not always permit, nor make desirable, the use of the phrase "HIJACK" Greg Rose ggr@acci.com.au
(From the "Rest" of RHF)