essential
likely
maybe
probably not
Front (prompt)
Class A airspace — altitude?
Plain English (default view) — short, conversational, lightly seasoned with science
🔬 Scientific / formula (revealed on click) — markdown + $$…$$ ok
**FL 180 – FL 600** MSL (18 000 ft to 60 000 ft MSL). IFR only. Not a drone concern — sUAS capped at 400 ft AGL.
💡 Mnemonic / memory aid (shown on hover)
A = Airliners. Above FL180. Never a drone's problem.
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