N.H. Rev. Stat. § 21-L:7

There is established within the department the division of aeronautics, rail, and transit, under the supervision of an unclassified director of aeronautics, rail, and transit, who shall be responsible for the following functions: I. Locating, constructing, and maintaining all air navigation facilities within the state which are built or maintained either in whole or in part with state funds. II. Coordinating agencies and persons participating in aircraft search and rescue missions within the state. III. Assisting state and federal officials in the investigation of civil aircraft accidents and civil aircraft incidents within the state. IV. Otherwise administering the provisions of RSA title XXXIX, relative to aeronautics. V. Assisting municipalities and others in planning, acquiring, developing, constructing, maintaining, operating, and improving safety at facilities included in the state airways system. VI. [Repealed.] VII. Planning, designing, and facilitating construction, and servicing rail and transit facilities including but not limited to pedestrian, bicycle, transit, rideshare, and railroad modes.