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**Class A airspace.** - **Floor:** Flight Level 180 (**18 000 ft MSL**). - **Ceiling:** FL 600 (**60 000 ft MSL**). - **Who uses it:** airliners and military. All operations are **IFR** only. - **Not a drone concern** — a sUAS under Part 107 is capped at **400 ft AGL**, nowhere near Class A.

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