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FastRouting: There is no valid airway between A & B on this route?

Reason:
If flying above the max flight level of the airway or below the minimum , then Fastrouting will ask this question. Or if you are trying to fly against direction of a one-way airway.

One way error – example

We fly from ROVOS to ALN at FL140

It says there is no valid airway. Go to show airway info and insert the airway in question in this case P899.

Very quickly we see that the airway is against the direction we want to go. That is why it is blocked in this case.