Industry Survey Reveals ADS-B In Knowledge Gap Among Airline Decision-Makers
A new Acron Aviation survey of 100 airline managers found that 51% have only 'general or limited' understanding of ADS-B In, and 34% cannot distinguish it from ADS-B Out — even as the ALERT Act mandating ADS-B In equipage by 2031 awaits Senate action. The gap matters for GA pilots too, as the bill's language may extend to general aviation aircraft.
Acron Aviation released a survey of 100 airline management professionals on June 4, 2026, and the results expose a troubling disconnect: the people responsible for fleet compliance decisions don't fully understand the technology they may soon be required to install. As the ALERT Act — which would mandate ADS-B In on most aircraft by December 31, 2031 — awaits Senate action after passing the House, the survey suggests the industry is more confident than it is informed.
What the Survey Found
The headline number looks reassuring: 86% of airline managers believe their organizations could comply with a potential ADS-B In mandate within three years. But dig one level deeper and that confidence starts to look premature. 51% of respondents described their understanding of ADS-B In as "general or limited," and 34% could not distinguish ADS-B In from ADS-B Out — two systems with fundamentally different functions and regulatory histories.
| Survey Finding | Result |
|---|---|
| Believe they can comply within 3 years | 86% |
| Described understanding as "general or limited" | 51% |
| Could not distinguish ADS-B In from ADS-B Out | 34% |
| Cited cost as top implementation barrier | 38% |
That last figure — a third of airline decision-makers unable to tell the two systems apart — matters more than it might appear. Compliance planning for a technology you don't fully understand tends to produce cost overruns, wrong equipment purchases, and missed deadlines.
ADS-B In vs. ADS-B Out: The Distinction That Matters
These are not interchangeable terms. ADS-B Out is the system most pilots and operators already know: it broadcasts your aircraft's GPS-derived position, altitude, and identification to ATC ground stations and other equipped aircraft. The 2020 FAA mandate required ADS-B Out on aircraft operating in most controlled airspace, and the industry largely complied.
ADS-B In is the receiver side. It listens for those same broadcasts and displays surrounding traffic on a cockpit screen — functioning like an enhanced traffic advisory system. It also receives FIS-B (Flight Information Services-Broadcast) weather data and TIS-B (Traffic Information Service-Broadcast) uplinks from the FAA ground network. ADS-B In is not currently mandated. Installing ADS-B Out hardware to meet the 2020 rule gave operators nothing on the receive side unless they specifically added In-capable avionics.
| System | Function | Mandated? |
|---|---|---|
| ADS-B Out | Broadcasts position/altitude to ATC and other aircraft | Yes — since Jan 1, 2020 |
| ADS-B In | Receives traffic and weather in the cockpit | No — ALERT Act pending |
The Business Case Is Already Written
The operational argument for ADS-B In doesn't require a regulatory mandate to be compelling. A Dallas/Fort Worth trial conducted with American Airlines documented a 12-second reduction in arrival spacing and 490,000 pounds of fuel saved in the first year alone. At current jet fuel prices, that's a real number on the balance sheet — not a projected benefit. The DFW data represents one airport, one airline, one year. Scale that across a national fleet operating into dozens of major hubs, and the efficiency case is straightforward.
The safety case was made more urgently in January 2025, when a midair collision near Reagan National Airport killed 67 people. ALPA — the Air Line Pilots Association — has stated the accident may have been preventable with widespread ADS-B In adoption, which would have placed both aircraft on each other's traffic displays in the critical seconds before impact. That collision visibly accelerated legislative interest in the ALERT Act.
What this means for GA pilots: If you already fly with a Garmin GDL 52, Stratus receiver, or a panel-mount with ADS-B In capability, you're already receiving FIS-B weather and TIS-B traffic uplinks anywhere you fly — at no subscription cost. That's the system working as designed. If your aircraft has only ADS-B Out (installed to meet the 2020 mandate), you have no traffic picture unless you added In-capable hardware separately. The ALERT Act's current language covers "most aircraft," but the Senate version has not been finalized — GA applicability, equipage timelines, and exemptions remain unsettled. Watch the Senate markup carefully before assuming your existing avionics are sufficient.
The Broader Principle
A survey that finds one-third of airline decision-makers cannot distinguish ADS-B In from ADS-B Out is not just a training problem — it's a signal about how regulatory compliance tends to work in practice. Industries often meet mandates by checking boxes rather than understanding systems, and the 2020 ADS-B Out requirement likely produced exactly that outcome for many operators: they bought the minimum hardware, filed the paperwork, and moved on. The ALERT Act, if enacted, will demand something more — a genuine grasp of what ADS-B In does, what it costs, and how to integrate it into cockpit workflow and operational procedures. The gap the Acron survey identified is not insurmountable, but it will not close on its own between now and 2031. The industry has time, and a clear operational and safety rationale. Whether airline management translates confidence into preparation before the Senate acts is the question worth watching.