What Is Prohibited Airspace? The One Type of Airspace You Truly Cannot Enter

Prohibited airspace is special use airspace, depicted on charts as “P-” followed by a number, where flight is forbidden for reasons of national security or welfare — and unlike restricted areas, you cannot get permission to enter it. It surrounds places like the White House, Camp David, and the Naval Observatory. The boundaries are absolute, the rules are simple, and the consequences for busting one are not.

This is one of those topics where the FAA actually made your life easy. There’s no clearance to request, no controlling agency to call, no hot-versus-cold schedule to memorize. The answer is always the same: stay out. Let’s break down exactly what prohibited airspace is, how to spot it, why it exists, and how it stacks up against the other special use airspace you’ll see on every sectional.

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What exactly is prohibited airspace?

Prohibited airspace is a defined block of airspace within which the flight of aircraft is prohibited. It is established under 14 CFR Part 73 as one of the categories of special use airspace, and it exists to protect ground sites where overflight would create a hazard to national security or welfare. No pilot certificate, rating, or clearance authorizes a Private Pilot to fly through it.

That last point is what makes prohibited airspace unique. Most of the airspace you’ll learn about has a way in. Class B wants a clearance. A restricted area wants you to check whether it’s active and coordinate with the controlling agency. Prohibited airspace has no such door. The Aeronautical Information Manual covers it in AIM 3-4-2, and the rule is binary: you’re either outside it or you’re in violation.

Each prohibited area carries a designator — the letter P followed by a number, like P-40 or P-56. That number ties to a published description in the FAA’s special use airspace listings, where you’ll find the exact lateral boundaries, the altitudes affected, and the times the area is in effect. For most prohibited areas, “time of designation” reads continuous.

How is prohibited airspace different from restricted airspace?

The difference comes down to one word: permission. Restricted airspace can be entered with authorization from the controlling agency when the area is “cold” (inactive); prohibited airspace can never be entered by a civilian pilot under any circumstance. Both are charted with similar blue hatched boundaries, so students mix them up constantly — but operationally they could not be more different.

A restricted area (designated with an R, like R-2508) contains invisible hazards to flight: artillery fire, aerial gunnery, guided missiles. When it’s hot, those activities are happening and you stay out. When it’s cold, you may be able to transit it with permission from the controlling agency, often through ATC. Restricted areas have a schedule, and that schedule matters to your flight planning.

Prohibited areas have no such nuance. There’s no hot or cold to check, no agency that grants you transit, no schedule that opens a window. Under 14 CFR § 73.83, no person may operate an aircraft within a prohibited area unless authorization has been granted by the using agency — and for a student or Private Pilot on a cross-country, that authorization simply isn’t on the table.

Why does prohibited airspace exist?

Prohibited airspace exists to protect the ground, not the airplane. While a restricted area shields you from a hazard in the sky, a prohibited area shields a sensitive location on the surface from being overflown at all. The reason given in the regulation is “national security or welfare” — and the sites it protects make that obvious the moment you see them.

The most famous example is P-56, which sits over the heart of Washington, D.C. It covers the White House, the Capitol, the National Mall, and the Naval Observatory (the Vice President’s residence). P-40 covers Camp David, the presidential retreat in Maryland. These aren’t places where the government wants to gamble on a wayward Cessna.

Because the threat is on the ground, the prohibition is total and permanent. There’s no activity to schedule around because the thing being protected never goes away. That’s the mental model to carry into your checkride: restricted equals hazard in the air with a schedule; prohibited equals protected site on the ground with no schedule and no entry.

How do I find prohibited airspace on a sectional chart?

You find prohibited airspace the same way you find every special use area — by reading the chart before you ever start the engine. Prohibited areas appear on VFR sectional and terminal area charts as a boundary outlined in blue hatching, labeled with a “P-” designator, and cross-referenced in a special use airspace tabulation box printed on the chart margin. That box lists the number, the altitudes, the time of use, and the controlling agency.

Pull up any sectional covering Washington, D.C., and you’ll see P-56 drawn right over the city. Run your eye to the tabulation box and you’ll find P-56A and P-56B listed with their altitudes (“To FL180” or “SFC to unlimited,” depending on the area) and the note that they’re in effect continuously. That tabulation box is the detail layer — the chart shows you where, and the box tells you the specifics.

This is exactly the skill the FAA tests under PLT040, interpreting airspace classes from charts and diagrams. On your knowledge test you may get a sectional excerpt and be asked to identify a hatched area, or asked which regulation governs it. The blue hatching plus the letter is your tell. P means prohibited, and prohibited means out.

If you fly with ForeFlight or another EFB, prohibited areas show up as shaded polygons you can tap for details — but learn to read the paper chart first. Knowing what the symbology means, not just where the app draws a red box, is what makes you day-one ready as a real pilot.

What happens if I fly into prohibited airspace?

Flying into prohibited airspace is a regulatory violation, and depending on which area you bust, the response ranges from a phone call to a fighter intercept. A prohibited area incursion can result in FAA certificate action — suspension or revocation — and near the most sensitive sites, you may be intercepted by military aircraft, ordered to land, and met by law enforcement. This is the one airspace mistake nobody waves off.

The severity scales with the site. Drift into a remote prohibited area and you may get a stern call from the FAA. Penetrate P-56 over Washington, D.C., and you’ve entered some of the most defended airspace on the planet, layered with additional flight restrictions like the DC Special Flight Rules Area and the Flight Restricted Zone. The AIM spells out the interception procedures you’d be expected to follow under Chapter 5, Section 6 (National Security and Interception Procedures) — worth knowing that they exist, even if you never plan to meet them.

The good news: avoiding this is entirely within your control. Prohibited areas don’t move, they don’t turn on and off, and they’re printed clearly on every chart. A thorough preflight review of your route — sectional out, finger on the line, eyes on the hatching — keeps you clear every single time. There’s no excuse the FAA accepts for “I didn’t know it was there,” because it’s right there in blue ink.

Where are the prohibited areas in the United States?

There are only a handful of prohibited areas in the United States, and they cluster around sites of national significance. The two every student pilot should be able to name are P-56 over Washington, D.C., and P-40 over Camp David, Maryland. A small number of others exist over locations the government has deemed sensitive enough to close to all flight.

Because the list is short and the areas are fixed, prohibited airspace is genuinely easy to plan around. The challenge isn’t volume — it’s awareness. A pilot flying a cross-country near the Mid-Atlantic needs P-56 burned into their mental map, because the surrounding Washington, D.C. airspace is some of the most procedurally complex in the country.

Always check current charts and NOTAMs, though. Special use airspace can be amended, and temporary flight restrictions (TFRs) regularly pop up over presidential movements, major sporting events, and disaster areas. A TFR isn’t the same thing as a prohibited area — it’s temporary and published by NOTAM — but the practical effect on you is identical: stay out. That’s covered under PLT376, special use airspace and TFRs.

If you want every layer of this — airspace, charts, regulations, and how they fit together into a flight you can actually fly — that’s the backbone of the Angle of Attack Private Pilot Ground School. We build the mental model first, then the test answers fall out of it naturally.

How prohibited airspace fits into special use airspace

Prohibited airspace is one of six types of special use airspace, and understanding the whole family makes prohibited areas easier to remember. Special use airspace consists of prohibited areas, restricted areas, warning areas, military operations areas (MOAs), alert areas, and controlled firing areas — each defined in 14 CFR Part 73 or the AIM, each telling you something different about what’s happening in that block of sky. Prohibited is the strictest of the six.

Here’s the quick rundown. Restricted areas hold hazards and need permission when cold. Warning areas are like restricted areas but sit over international waters, beyond the three-mile limit. MOAs are where the military trains — you can legally fly through VFR, but you’d better be heads-up for fast traffic. Alert areas flag high-volume training or unusual activity, with no special clearance required. Controlled firing areas shut down their activity when an aircraft approaches, so they’re not even charted.

Slot prohibited airspace into that lineup and it stands out as the absolute. Everything else has a condition, a permission, or a “use caution.” Prohibited has none. That contrast is exactly why the FAA loves to test it — and why a good pilot never confuses the blue hatched P with the blue hatched R.

A note from the cockpit

I teach a lot of this from a different corner of the country. Up in Alaska, where I do most of my flying, you won’t trip over a prohibited area the way you might near Washington — but the discipline of reading the chart before you fly is the same everywhere, and it’s a habit I drill into every student.

Here’s the thing I tell people who get nervous about airspace: prohibited areas are the easy ones. I’ve watched students sweat over Class B clearances and restricted area schedules, then breeze right past prohibited airspace on the chart like it’s nothing — which, honestly, is the right instinct, because the rule is so simple. The trap isn’t complexity. The trap is complacency. The pilot who busts a prohibited area didn’t misunderstand it; they just never looked.

So when I brief a cross-country with a student in the 172, I make them physically trace the magenta line with a finger and call out every piece of special use airspace it passes near — P, R, MOA, all of it — out loud. It takes ninety seconds. That ninety-second habit is what keeps a careless mistake from becoming a certificate action. Aviation rewards the boring, repeatable stuff, and there’s nothing more boring or more important than reading your chart.

If you’re just starting out and want a guided, structured way to build that habit, the free Total Student Pilot course walks you through your first lessons — including how to actually read a sectional — before you ever spend a dime.

PLT Study Guide

The FAA tags every knowledge-test question with a PLT (learning statement) code. For prohibited airspace, these are the codes that actually match the content — translated into plain-English study points.

PLT393 — Recall regulations: controlled / restricted airspace requirements. Know that prohibited areas are established under 14 CFR Part 73 and that § 73.83 forbids operating an aircraft within a prohibited area without authorization from the using agency. For your purposes, that means no entry. This is the core regulatory citation for the topic.

PLT376 — Recall regulations: airspace, other, special use / TFRs. Understand that prohibited airspace is one type of special use airspace, and be able to distinguish it from restricted, warning, MOA, alert, and controlled firing areas. Also know that a temporary flight restriction (TFR), published by NOTAM, can close airspace temporarily for similar security reasons.

PLT161 — Recall airspace classes: limits / requirements / restrictions / airspeeds / equipment. Be able to state the defining restriction of a prohibited area: flight is not permitted. Know that the area’s altitudes and times of use are published in the special use airspace tabulation, and that prohibited areas are typically in effect continuously.

PLT040 — Interpret airspace classes: charts / diagrams. Given a sectional chart excerpt, identify a prohibited area by its blue hatched boundary and “P-” designator, and locate its details in the tabulation box on the chart margin. Don’t confuse the P boundary with the visually similar R (restricted) boundary.

Frequently Asked Questions

Prohibited airspace might be the simplest airspace concept you’ll learn — one rule, no exceptions, clearly drawn on every chart. But simple doesn’t mean unimportant. The pilots who get burned aren’t the ones who misunderstood the rule; they’re the ones who never looked at the chart. Build the habit now, trace your route every time, and prohibited areas become a non-event for the rest of your flying life.

FROM CHRIS

Keep your chart out, keep your finger on the line, and keep learning. You’ve got this.

Throttle On!

Chris Palmer

Founder & Chief CFI, Angle of Attack — Two-Time Master Aviation Educator and Gold Seal CFI