### Question
What does national park mean?


### Answer
**National park** has the following meaning in *49 U.S.C. § 40128*:

> any unit of the National Park System

#### Citation:
  - *49 U.S.C. § 40128*
  - Heading: **SUBTITLE VII-AVIATION PROGRAMS > PART A-AIR COMMERCE AND SAFETY > subpart i-general > CHAPTER 401-GENERAL PROVISIONS**

