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 infection causes red-brown, irritated patches of skin in the armpits or other moist areas of skin. 2  Armpit boil (furuncle): A skin infection of a single hair follicle and surrounding skin. 3  It causes a painful, red lump on the skin, which may grow into an abscess.