By Sarina Houston. Updated March 01, 2015. Class D airspace surrounds airports that have an operating air traffic control tower, but do not have radar services (or at least are not required to.) Airspace surrounding a Class D airport is only classified as a Class D airport when the tower is in operation.
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The definition of invidious is something that is likely to cause anger, or something that is unjust or unfair. An example of an invidious behavior is behavior that is likely to make others around you mad. An example of invidious actions are discriminatory actions where one person is treated unfairly as compared to others. invidious. invidious.