### Question
What does city pair mean?


### Answer
**City pair** has the following meaning in *39 U.S.C. § 5402*:

> service between an origin and destination city pair

#### Citation:
  - *39 U.S.C. § 5402*
  - Heading: **PART V-TRANSPORTATION OF MAIL > CHAPTER 54-TRANSPORTATION OF MAIL BY AIR**

