Which of the following is included on Low Altitude En Route charts but not on High Altitude ER charts?

Low Altitude En Route charts are designed for navigation primarily by aircraft operating below 24,000 feet, while High Altitude En Route charts cater to aircraft operating above that altitude. The inclusion of Military Operations Areas (MOAs) on Low Altitude En Route charts but not on High Altitude En Route charts serves a specific purpose related to the operational environment in which these charts are used.

MOAs are designated airspace areas where military training activities are conducted, and they have specific flight rules that may apply to civilian aircraft. Since Low Altitude En Route charts are used by flights at lower altitudes, which are more likely to operate in proximity to such military training activities, MOAs are relevant for these charts. In contrast, as air traffic moves to higher altitudes, the presence of military training operations may not be as pronounced, thus rendering the depiction of MOAs on High Altitude En Route charts redundant for that operational scope.

On the other hand, prohibited areas, warning areas, and restricted areas are generally relevant irrespective of altitude and thus have visibility on both types of en route charts, although the use cases and user advisories may differ. This delineation emphasizes the importance of the specific operational altitudes and environments where the respective charts are utilized