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.
Armpit Rash Causes. An armpit rash may be caused due to several different factors. Three of the most common causes of an armpit rash include friction, elevated heat and exposure to allergens. 1  The underarm skin is quite sensitive and can be easily irritated via friction. Heat rash is a condition caused due to elevated perspiration which results in the blockage of the sweat ducts occurring beneath the skin. 2  The sweat trapped under the skin then causes the formation of a bumpy armpit rash, which can occasionally be painful.