| Name | Data Type | Definition | ||
|---|---|---|---|---|
| nilReason | NilReasonEnumeration | |||
| ENR | string | En-route holding. | Inherited from CodeHoldingUsageBaseType | |
| TER | string | Terminal area holding. | Inherited from CodeHoldingUsageBaseType | |
| OTHER | string | Other. | Inherited from CodeHoldingUsageBaseType |