41. Passenger miles rose 4 . 5 percent, well under the 10 . 7 percent increase in capacity.42. Revenue rose in the latest quarter, but passenger traffic, measured in revenue passenger miles flown, fell slightly. 43. Free tickets purchased with frequent-flyer miles account for an average of 8 percent of airlines'revenue passenger miles . 44. It is often reported that air travel is the safest in terms of deaths per passenger mile . 45. Northwest's overall passenger traffic increased 3 . 3 percent to 18 . 14 billion revenue passenger miles . 46. Revenue passenger miles were up 4.4 percent. 47. Revenue passenger miles can be considered the basic amount of " production " that an airline creates. 48. Continental's revenue passenger miles dropped 6.2 percent. 49. United's traffic increased 5 . 1 percent in March to 10 . 4 billion revenue passenger miles . 50. The company said on Monday revenue passenger miles , a measure how profitable flights are, rose 22 percent.
