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.
Causes of armpit lumps. Most lumps are harmless and are usually the result of abnormal tissue growth. However, armpit lumps can be related to a more serious underlying health problem. Any unusual lumps should be carefully evaluated by a doctor.