Current Aviation Transport Security Regs:
(4) A person must not be allowed to enter the cockpit after the
aircraft has taken off unless:
(a) he or she is authorised to do so by the aircraft’s pilot in command or the aircraft’s operator and:
(i) is a member of the aircraft’s crew; or
(ii) is an employee of the aircraft’s operator; or
(iii) is authorised or required by the Civil Aviation Regulations 1988 or the Civil Aviation Safety Regulations 1998 to enter the cockpit; and
(b) he or she holds appropriate identification as a person referred to in paragraph (a).