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“FIR” - In destination Flight Information Region NB! We have to define FIR here. Significant airspace volume and the airport might be close to or far from the edge. The https://aci-standards.atlassian.net/wiki/spaces/ACIDD/pages/17694783 is in the FIR that cover the destination airport. Can transition to: FNL, LAN
Other statuses might be defined at a later stage. System specific values are allowed, but please use 4 characters.
Which statuses and transitions that actually are used are system dependent. Other transitions than the ones listed might be allowed by a system, and might be necessary due to limited data.
Comments
A transition to “DEL” (if used) and “UKN” can in theory happen from all states.
"UKN” Unknown indicates missing information. Usually this means that it’s time based when a state transition to unknown.
"DEL” It is a matter of system design if this state is used. Deleted flights can be physically deleted (in databases), but they can also be marked as deleted and become "invisible". If “DEL” is used as a status then it is set when information arrives that explicitly deletes the flight leg, or when it can be deduced that it is an erroneous entry that should be deleted (ghost flights for instance).
"CAN” A cancelled flight will often not be deleted, but only marked as cancelled. There are IATA messages that can cancel a flight (leg) and then reinstate it later.