| C | Minimum Charge per Carload or Trailer |
| D | Department of Defense Unique Freight Class |
| E | Rate per Unit Applicable only to Units in Excess of a Specific Threshold Amount |
| F | Department of Defense Freight All Kinds, Class 100 |
| L | LTL (Less Than Truckload) Rate Indicates that a less-than-truckload rate has been applied to the shipment |
| M | Minimum Charge |
| N | No Rate for This Application |
| P | Percent of Minimum Charge |
| R | Rate per unit subject to minimum units specified, if any |
| S | Minimum Charge per Shipment |
| T | TL (Truckload) Rate Indicates that a truckload rate has been applied to the shipment |