Conditional Routes (CDRs) are special flight paths in the air traffic system that are not always available. These routes can be used under specific conditions, making them flexible for flight planning. CDRs are categorized based on their availability:
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Category One: Permanently Plannable CDR – These routes can always be planned for use.
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Category Two: Non-Permanently Plannable CDR – These routes may be available at certain times, depending on various factors.
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Category Three: Not Plannable CDR – These routes cannot be planned and are only available in rare situations.
Understanding these categories helps pilots and planners make informed decisions about flight paths.
