Revenue passenger miles. Revenue passenger miles (or RPM) measures demand for air transport. Itâs calculated as the number of revenue passengers multiplied by the total distance traveled. Itâs also called airline âtraffic.â. An increase in RPM is positive for an airline company. It means that more passengers are using their service.
Definition. An armpit lump is a swelling or bump under the arm. A lump in the armpit can have many causes. These include swollen lymph nodes, infections, or cysts.
The symptoms of armpit lumps vary depending on the type of lump you have: 1  Swollen/enlarged lymph nodes: The lump is located under the skin and is usually tender to the touch. 2  Cysts: The lump may cause the skin to be yellowish in color. 3  Abscesses: The lump may be large and painful.  Lipomas: Lipomas develop under the skin.