| Name | Data Type | Definition | |
|---|---|---|---|
| RWY | string | Taxi line on a runway surface, leading between the runway and other airport surfaces. | |
| TWY | string | Taxi line on a taxiway surface, leading between the taxiway and other airport surfaces. | |
| APRON | string | Taxi line on the apron surface. | |
| GATE_TLANE | string | Taxi line on the apron surface, leading to a gate/stand. | |
| LI_TLANE | string | Lead-in taxi line. | |
| LO_TLANE | string | Lead-out taxi line. | |
| AIR_TLANE | string | A virtual taxi line in the air, used by helicopters. | |
| OTHER | string | Other. |