Special Use Airspace: MOAs, Restricted Areas, and the Hatched Lines on Your Sectional You Cannot Afford to Ignore

The hatched lines, shaded regions, and letter-number codes on a VFR sectional chart represent special use airspace - designated blocks where something unusual, hazardous, or security-sensitive is happening. Understanding what each type means, and what it requires of you, is not optional knowledge. It determines whether you can legally and safely fly your planned route.

The FAA divides special use airspace into two broad categories: regulatory and non-regulatory. Regulatory airspace is codified in the Federal Aviation Regulations. Entering it without authorization is a federal violation. Non-regulatory airspace carries no legal prohibition but warns of elevated risk or unusual activity. Every type of special use airspace falls into one of these two camps, and knowing which is which changes how you plan.

What Are Prohibited Areas, and Can You Ever Fly Through One?

No. Prohibited Areas are exactly what the name says - you are not permitted to fly in them under any circumstances. There are no exceptions for VFR traffic, no checking whether the activity is “cold,” and no creative routing through the edges.

On a sectional chart, Prohibited Areas appear with a solid blue outline and the letter P followed by a number. The most prominent examples surround Washington, D.C.: P-40 and P-56 encircle the capital, and P-49 covers Camp David. These exist for national security reasons.

The consequences of busting a Prohibited Area include intercept aircraft, FAA certificate action, and possible federal law enforcement contact. When planning near any P-area, give it a clear, deliberate wide berth.

How Do Restricted Areas Work, and When Can You Enter?

Restricted Areas exist because genuinely hazardous activities take place within them - artillery fire, missile testing, and military gunnery operations. Unlike Prohibited Areas, entry may be possible under certain conditions, but that word “may” carries significant weight.

On the chart, Restricted Areas appear with a blue hatched border and the letter R followed by a number. You will find them near major military installations like Fort Liberty in North Carolina, Eglin Air Force Base in Florida, and White Sands in New Mexico.

Restricted Areas are either active or inactive. When active, you must have explicit permission from the controlling agency, which is listed in the Chart Supplement (the FAA’s replacement for the Airport Facility Directory). Their frequency is often printed on the sectional as well. When the area is inactive and the hazardous activity has ceased, you can transit it without special authorization.

The critical mistake is assuming a Restricted Area is inactive because it looks empty from altitude. A missile range can appear completely empty from 10,000 feet and still be actively firing. Check before you depart, not as you approach the boundary.

Many military ranges operate on weekday schedules and may be entirely inactive on weekends. Flight Service can provide a schedule before your departure. Knowing this in advance can eliminate an unnecessary route deviation.

Can VFR Pilots Fly Through a Military Operations Area (MOA)?

Yes - but legality and safety are two different things. MOAs are non-regulatory airspace for VFR pilots. You do not need permission to enter. However, understanding what happens inside an active MOA should inform your decision-making significantly.

MOAs are designated blocks where the military conducts high-speed maneuvering, air combat training, and formation flight. Fighters operating in a MOA may be in nose-low dives, changing formation at speed, or pulling high angles of attack. At those velocities, reaction time is essentially zero - and their see-and-avoid capability is severely limited.

On the sectional, MOAs appear as magenta hatched areas with names printed inside them. Well-known examples include the Dare MOA along the eastern seaboard, the Jedi MOA in California, and the Tombstone MOA in Arizona. The chart includes the altitude block and hours of operation for each.

Before flying through any MOA, call Flight Service and ask for its status. If it is inactive, transit without concern. If it is active, route around it when practical. If you must fly through an active MOA, contact the controlling agency on their listed frequency or ask ATC for traffic advisories if you are on flight following.

What Are Warning Areas, and Where Do You Encounter Them?

Warning Areas contain the same types of hazardous military activities found in Restricted Areas, but they exist primarily over international waters off the U.S. coast. Because the FAA lacks sovereignty over international airspace, these zones cannot be legally restricted - so they are designated to warn pilots instead.

Warning Areas use a hatched border similar to Restricted Areas but carry a W prefix. They appear off the coast of Florida, along the East Coast, and in the Pacific. The practical guidance mirrors MOAs: check the status before entering, seek advisories when available, and route around active Warning Areas when you can.

What Does an Alert Area Mean on a Sectional?

Alert Areas indicate that a high volume of pilot training or unusual aerial activity is concentrated in that airspace. They are entirely non-regulatory - VFR pilots may enter freely, with no permissions or communications required.

Alert Areas appear with a magenta outline and the letter A followed by a number. What the designation communicates is: be extra vigilant here. You may encounter student pilots in pattern work, parachute operations, or formation training. The area around Vance Air Force Base in Oklahoma is a well-known example, where military student pilot traffic is concentrated and see-and-avoid is your primary defensive tool.

What Is a Controlled Firing Area, and Why Isn’t It on the Chart?

Controlled Firing Areas involve the use of certain weapons and explosives, but they do not appear on the sectional at all. The reason: the firing activity is required to stop whenever an aircraft approaches. Spotters on the ground are responsible for detecting incoming traffic and ceasing operations. Because the hazard accommodates you rather than the other way around, there is no need to depict or restrict the area on a chart.

What Are National Security Areas?

National Security Areas are designated near sensitive infrastructure - nuclear facilities, major dams, critical utilities - where the FAA has determined that extra vigilance is warranted. They appear on the chart with a magenta dashed border.

The FAA formally requests that pilots avoid flying through National Security Areas. “Requests” means this is not a regulatory prohibition. That said, a request from the FAA regarding national security infrastructure warrants serious consideration, not casual dismissal.

How Do TFRs Work, and Why Do Pilots Get Busted by Them?

Temporary Flight Restrictions (TFRs) are issued by NOTAM and can appear with very little advance notice. They are not permanent airspace designations - they are temporary restrictions tied to specific events or conditions, and they expire when the triggering event ends.

Presidential TFRs are the most commonly encountered. When the President travels, a two-ring TFR surrounds his location. The inner ring extends 10 nautical miles and is effectively off limits. The outer ring spans 10 to 30 nautical miles, and flight within it requires two-way radio communication with ATC.

TFRs also appear for wildfires, natural disasters, sporting events, and airshows. A stadium TFR during a major professional football or baseball game extends 3 nautical miles and up to 3,000 feet AGL, beginning one hour before the event and ending one hour after.

The reason pilots get caught is almost always the same: they checked the night before, not the day of. TFRs must be checked on the day of flight, during preflight planning. Your electronic flight bag - ForeFlight, Garmin Pilot, or similar - will display active TFRs on the map. Flight Service will include them in a standard weather briefing. The FAA also maintains a dedicated TFR website.

Busting a presidential TFR carries the same consequences as other high-profile violations: intercept aircraft, likely certificate action, and contact with federal authorities. This happens to real pilots every year because they did not check.

How to Evaluate Special Use Airspace During Cross-Country Planning

Use this framework every time you plan a cross-country route:

1. Scan the entire corridor for hatched borders, shaded regions, and letter-number designations. Anything that is not standard controlled airspace deserves a closer look.

2. Categorize what you find. P, R, W, MOA, or A - each type has different rules and a different required action on your part.

3. Check the altitude block. A Restricted Area capping at 8,000 feet MSL will not affect a cruise at 10,500. A MOA that runs from the surface to FL180 affects you at any altitude.

4. Check hours of operation. A MOA active Monday through Friday, 0700–2200 poses no factor on a Saturday afternoon flight.

5. Verify active status. If there is any uncertainty, call Flight Service. That is their function. Do not assume.

6. Plan alternate routing in advance. If there is a real possibility a Restricted Area will be active, identify your alternate routing before departure - not while watching the restricted boundary approach on your moving map.

Key Takeaways

• Prohibited Areas (P) are absolute no-fly zones with no exceptions for VFR traffic - give them wide berth.
• Restricted Areas (R) may be transitable when inactive, but always verify status through Flight Service or the controlling agency before entering.
• MOAs are legal to enter as a VFR pilot without permission, but active MOAs contain high-speed military aircraft with near-zero reaction time - route around them when practical.
• TFRs can appear with little notice and disappear just as fast - checking must happen on the day of flight, not the night before.
• The practical planning sequence - categorize, check altitude, check hours, verify active status, plan alternate routing - applies to every type of special use airspace and should become automatic.