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High Altitude Airways are generally for use above 18,000 (class A airspace) while Low Altitude Airways are used below 18,000. Since they are primarily for IFR use. The HHA (High) charts don't provide much terrain detail unlike sectionals. Their primary purpose is to show the airway info. Each Airway has a designation (like a highway number) and the charts will show the appropriate VOR radials and distances for the Airways.

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Q: What is the difference between low and high IFR charts?
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