Where can mountainous terrain be located as per AFI 11-202V3 regulations?

Mountainous terrain can be located in both CONUS (Continental United States) and other areas that exhibit significant elevation change. The term "CONUS" encompasses all the states within the continental United States, which indeed include various regions known for their mountainous landscapes such as the Rocky Mountains and the Sierra Nevada.

Furthermore, the phrase "other areas with significant elevation change" recognizes that mountainous terrain is not exclusive to the continental U.S., as it can also be found in various places such as parts of Alaska, some U.S. territories, and regions outside of the contiguous United States that feature significant variations in elevation. This acknowledgment aligns with the general understanding defined by AFI 11-202V3, which stresses the importance of recognizing potential hazards, including those posed by mountainous areas in different geographic locations.

The other choices are limited in scope, either erroneously restricting mountainous terrain to certain areas or ignoring the broader geographical implications of where such terrain can exist. This understanding is crucial for pilots and flight operations, as mountainous terrain presents unique challenges that must be navigated in terms of instrument flying and overall flight safety.