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 cause is unknown; the perspiration is not due to anxiety or stress. 2  Irritant contact dermatitis: Skin inflammation (redness, swelling, pain, or heat) caused by an irritating substance touching the skin. 3  Soaps, deodorant, alcohol, and dry air may all cause irritant contact dermatitis of the armpit.