Which Class is described as 'All other controlled airspace'?

Which Class is described as 'All other controlled airspace'?

• A. Class A
• B. Class B
• C. Class D
• D. Class E

Answer: (D)

All other controlled airspace refers to Class E. This category covers the bulk of controlled airspace that isn’t designated as Class A, B, C, or D. It includes en route and transition airspace, many federal airways, and various low-altitude areas designated to provide controlled conditions for IFR operations, as well as some surface and near-surface zones around airports when they’re not in the higher-profile terminal areas. The idea is to maintain controlled airspace for IFR traffic across most of the sky, while the other classes designate specific, more restricted environments around particular airports or at higher altitudes.

All other controlled airspace refers to Class E. This category covers the bulk of controlled airspace that isn’t designated as Class A, B, C, or D. It includes en route and transition airspace, many federal airways, and various low-altitude areas designated to provide controlled conditions for IFR operations, as well as some surface and near-surface zones around airports when they’re not in the higher-profile terminal areas. The idea is to maintain controlled airspace for IFR traffic across most of the sky, while the other classes designate specific, more restricted environments around particular airports or at higher altitudes.