According to the U.S. Census Bureau, the county has a total area of 685 square miles (1,770 km2), of which 681 square miles (1,760 km2) is land and 3.8 square miles (9.8 km2) (0.6%) is water. It is the fourth-largest county in Tennessee by area. The county is located atop the Cumberland Plateau.
Revenue passenger kilometres (RPK) is a measure of the volume of passengers carried by an airline. A revenue passenger-kilometre is flown when a revenue passenger is carried one kilometre. A passenger for whose transportation an air carrier receives commercial remuneration is called a revenue passenger.
PPK vs CPK. PPK and CPK are mainly process capability indices. When PPK stands for Process Performance Index, CPK stands for Process Capability Index. Both PPK and CPK have very wide impacts on the performance strategy of organisations and they are very closely watched. CPK or Process Capability Index is an index that measures how a process is running to its specification limits in relation to the natural variability of the process.