essential
likely
maybe
probably not
Front (prompt)
Class D airspace — altitudes, sectional marking?
Plain English (default view) — short, conversational, lightly seasoned with science
🔬 Scientific / formula (revealed on click) — markdown + $$…$$ ok
D = **Dashed blue Donut.** - 📐 **Altitudes** - Floor: surface - Ceiling: typically **2 500 ft AGL** - 🎨 **Sectional marking:** 🟦 **dashed** blue lines - 🏛️ **Shape:** single cylinder, ~4–5 NM radius - 🛸 **sUAS rule:** ATC authorization required (via LAANC) - 🏛️ **Found at:** small towered airports
💡 Mnemonic / memory aid (shown on hover)
D = Dashed blue Donut. Small 4-5 NM cylinder, 2500 AGL.
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