The reason for the regulation is indicated by the responsible Flow Management Position FMP.
For post-ops analysis individual delay codes can be included in a ATFM delay group.
| REF LOC | REGU REASON CODE | REGU REASON NAME | REASON GROUP | ATTRIBUTE |
|---|---|---|---|---|
| Airport | C | ATC Capacity | AD Capacity (ATC) | Airport / TMA |
| Airport | S | ATC Staffing | AD Staffing (ATC) | Airport / TMA |
| Airport | I | Industrial Action (ATC) | AD Disruptions (ATC) | Airport / TMA |
| Airport | T | Equipment (ATC) | AD Disruptions (ATC) | Airport / TMA |
| Airport | G | Aerodrome Capacity | AD Capacity | Airport / TMA |
| Airport | M | Military Activity | AD Capacity | Airport / TMA |
| Airport | R | ATC Routeing | AD Capacity | Airport / TMA |
| Airport | V | Environmental Issues | AD Capacity | Airport / TMA |
| Airport | A | Accident/Incident | AD Disruptions | Airport / TMA |
| Airport | E | Aerodrome Services | AD Disruptions | Airport / TMA |
| Airport | N | Industrial Action (non-ATC) | AD Disruptions | Airport / TMA |
| Airport | NA | Not regulated/Not specified | AD Disruptions | Airport / TMA |
| Airport | O | Other | AD Disruptions | Airport / TMA |
| Airport | P | Special Event | AD Events | Airport / TMA |
| Airport | D | De-icing | AD Weather | Airport / TMA |
| Airport | W | Weather | AD Weather | Airport / TMA |
| En route | C | ATC Capacity | ER Capacity (ATC) | En route |
| En route | S | ATC Staffing | ER Staffing (ATC) | En route |
| En route | I | Industrial Action (ATC) | ER Disruptions (ATC) | En route |
| En route | T | Equipment (ATC) | ER Disruptions (ATC) | En route |
| En route | G | Aerodrome Capacity | ER Capacity | En route |
| En route | M | Military Activity | ER Capacity | En route |
| En route | R | ATC Routeing | ER Capacity | En route |
| En route | V | Environmental Issues | ER Capacity | En route |
| En route | A | Accident/Incident | ER Disruptions | En route |
| En route | E | Aerodrome Services | ER Disruptions | En route |
| En route | N | Industrial Action (non-ATC) | ER Disruptions | En route |
| En route | NA | Not regulated/Not specified | ER Disruptions | En route |
| En route | O | Other | ER Disruptions | En route |
| En route | P | Special Event | ER Events | En route |
| En route | D | De-icing | ER Weather | En route |
| En route | W | Weather | ER Weather | En route |
| na | NA | Not regulated/Not specified | ER Disruptions | En route |