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.
1 The lymph nodes are located under your arm. This is why many people, especially women, get nervous when they find an armpit lump.  The lumps can be caused by bacterial or viral infections, allergies, harmless fat or tissue growths, and cancerous growths.