Keeping Track of Your Blocked Aircraft

Understanding how to track blocked aircraft has become increasingly complex. While operators once relied on straightforward FAA blocking processes to maintain privacy, evolving tracking technologies now affect how blocked aircraft information is displayed across flight tracking platforms.

The comfort of knowing your Aircraft Situation Display to Industry (ASDI) information is “blocked” or unable to be tracked on websites is becoming more of a discomfort for some operators thanks to Automatic Dependent Surveillance-Broadcast, or ADS-B.

What Does “Blocked” Mean?

“Blocked” indicates the aircraft’s operator has requested that its flight information not be displayed publicly on sites such as FlightRadar24.

In practice, this means the aircraft’s identifying data, such as its tail number, may not appear in public FAA live data feeds used by common flight tracking websites. For many operators, blocking was historically a reliable method of maintaining operational privacy.

A few years ago, all it took to have your tail number blocked was a simple request to the National Business Aviation Association (NBAA). Once a month, the requested batch of tail numbers would be entered into the Federal Aviation Administration (FAA) live data feed. Depending on the level of blocking desired, the tail number would be blocked accordingly.

The process was, and remains, straightforward and relatively painless, with one exception: operators must choose the level of blocking.

Why Operators Block Their Aircraft

Operators block their aircraft for reasons that include privacy, operational security, and confidentiality of sensitive missions. Blocking is often used by private jets, military flights, or high-profile travelers seeking to limit public visibility of their movements.

For many flight departments, maintaining discretion is an operational requirement. Blocking at the appropriate level provides a measure of control over how flight data is distributed and who can access it.

However, while blocking can reduce public exposure, it does not always eliminate the ability to track aircraft under certain circumstances.

How Blocking Works

There are two choices when registering for the FAA blocking program.

Industry-Level Blocking

One choice blocks FAA live data at the internet provider level. In this case, internet providers such as flight tracking websites are responsible for blocking tail numbers included on the list they receive each month.

Failure to adhere to blocking these tail numbers could result in the FAA terminating their live feed of air traffic data to the website. This creates a strong incentive for flight tracking websites to respect the blocked tail number list.

There are benefits to being blocked at the internet level. For a fee, your flight department can track the aircraft and smart FBOs can track your arrival into their facility.

On the downside, although your tail number does not show, if you are flying, for example, from Teterboro to London Stansted and have filed your flight plan, a flight plan for your aircraft type from Teterboro to London Stansted will appear on public flight tracking websites.

This means that while the tail number itself is not visible, operational details such as route and aircraft type may still indicate movement.

FAA-Level Blocking

The other choice is to block the tail number at the FAA level. This is the most secure choice.

When blocked at the FAA level, the FAA does not send any live data from your aircraft to internet providers. The data remains within FAA towers and systems. Internet providers are unable to access FAA data when flight plans and call signs are filed under a double-blocked tail number.

The benefit of FAA-level blocking is privacy, provided the flight plan and call sign are the tail number of the aircraft. The FAA does not send data externally on your tail number. FBOs should not be able to track your arrival, and individuals should not be able to see the aircraft via FAA data online.

In both cases, flight tracking blocked aircraft depends on how and where the data is being sourced.

Impact on Flight Tracking

Even with blocking in place, the flight tracking environment has changed.

If an aircraft is blocked at either level and uses a call sign, the aircraft is fully trackable by that call sign. This means that although the tail number is suppressed, the call sign can still provide a tracking pathway.

With ADS-B technology, aircraft can be tracked at almost any time in nearly every corner of the world. ADS-B has become a significant factor in the evolution of flight tracking blocked aircraft.

ADS-B is part of the FAA’s NextGen air traffic modernization program. The FAA requires that all aircraft operating in airspace that requires a Mode C transponder be equipped with ADS-B by 2020. However, ADS-B does not replace the transponder requirement.

With ADS-B Out capability, aircraft broadcast encrypted data on position, airspeed, and altitude based on GPS. This information can be picked up by ground stations and nearby aircraft.

ADS-B In, which is not included in the FAA mandate, requires additional equipment and allows aircraft to receive data from ADS-B ground stations and other aircraft broadcasting with ADS-B Out.

Thousands of aviation enthusiasts have installed ADS-B receiver antennas around the world, pooling this data and contributing it to popular flight tracking websites.

As a result, even if FAA data remains blocked as previously arranged, ADS-B data collected independently can make it easier to view aircraft that were once fully blocked.

Tracking Blocked Aircraft

Standard services such as FlightRadar24 and similar platforms do not display blocked flights based on FAA data. However, premium or alternative tracking methods may offer limited visibility depending on how the aircraft is filed and identified.

Some platforms aggregate ADS-B data from independent receivers and may display aircraft data that is not visible through traditional FAA data feeds. This means that even with FAA-level blocking, tracking blocked tail numbers can sometimes be achieved through call sign tracking or ADS-B data.

What does this mean for a flight department assuming their aircraft is fully blocked?

It means that ADS-B technology can prevent aircraft from being fully blocked on certain websites, although knowledge is required to interpret and access the available information.

FAA data remains blocked as previously arranged. That has not changed. However, ADS-B data gathered from private citizens and shared with flight tracking websites has altered the landscape of aircraft privacy.

Understanding how to track blocked aircraft today requires recognizing the difference between FAA data blocking and independently sourced ADS-B data.

Operational Awareness in a Changing Tracking Environment

For operators evaluating how to track blocked aircraft or assess their own visibility, the key consideration is understanding where the tracking data originates.

Blocking at the internet level limits what public flight tracking websites display based on FAA feeds. Blocking at the FAA level provides greater privacy by preventing live data distribution from the source. However, ADS-B broadcasts, when collected independently, can still make aircraft movements observable.

This shift does not eliminate the value of blocking programs. Rather, it highlights the importance of understanding how flight tracking blocked aircraft functions under both FAA data feeds and ADS-B networks.

Aircraft may still appear with suppressed identifiers, generic labels, or under call signs rather than tail numbers. In some cases, route visibility may remain even when the aircraft identity is hidden.

Operators should evaluate their blocking choices based on operational needs, privacy requirements, and how their flight plans and call signs are filed.

Conclusion

The ability to track blocked aircraft has evolved alongside tracking technology.

While FAA blocking programs continue to prevent live FAA data distribution at selected levels, ADS-B technology and independently sourced receiver networks have changed how aircraft data becomes visible online.

Understanding the distinction between industry-level and FAA-level blocking, the role of call signs, and the impact of ADS-B Out broadcasting is essential for flight departments assessing aircraft visibility and privacy.

For operators seeking clarity on aircraft tracking visibility, flight data handling, and operational planning, UAS International Trip Support provides aviation trip support services, urgent trip support services, and emergency aviation trip support services as an international trip support company.

To discuss your operational requirements and aircraft support needs, contact UAS International Trip Support through our Contact Us page.