Which flight plan type does not initiate search and rescue procedures by any organization?

When no flight plan is filed, there is no official record of the flight's intended route, departure, or arrival information. This absence of a flight plan means that air traffic control and search and rescue organizations do not have the necessary information to initiate search and rescue procedures for that aircraft. In situations where an aircraft does not arrive at its destination and has not filed a plan, it can be difficult for authorities to determine whether a search is warranted, leading to a lack of formal search and rescue actions.

In contrast, an IFR (Instrument Flight Rules) flight plan and a VFR (Visual Flight Rules) flight plan each provide specific details about the flight. These details allow for tracking and monitoring, thus triggering search and rescue protocols if the aircraft does not reach its destination. The DVFR (Defense VFR) flight plan, although less common, is also designed for military operations and similarly would initiate search and rescue processes. Hence, the absence of a filed flight plan is the key reason why search and rescue actions are not initiated.