### Question
What is the definition of 121 mainline passenger carrier?


### Answer
The definition of **121 mainline passenger carrier** is as follows in *39 U.S.C. § 5402*:

> a mainline carrier providing passenger service through scheduled service on routes under part 121

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

