Air traffic control capacity and staffing caused 49% of Europe's en-route flight delay in summer 2026. In the US, the FAA had about 11,000 certified controllers in April 2026, against a target of 12,563. We pulled together the official numbers on controllers, pilots, cabin crew and ground staff, and on how each shortage shows up in delays.
Why this matters: staff shortages show up as slot restrictions, capped airports and late rotations. Some of them are planned months ahead, others happen on the day. Knowing which ones are structural helps travellers pick routes and times, and gives journalists numbers that go beyond one bad weekend.
Key Takeaways
- ATC staffing problems caused 18.1% of Europe's en-route delay from January to September 2026, the highest share since 2019. France and Greece produced 87% of those staffing minutes.
- Even on the FAA's own forecast, the US will have 11,312 certified controllers in 2028, still about 1,250 short of its new, lower target.
- Boeing forecasts that airlines will need 2.4 million new pilots, technicians and cabin crew by 2045, two-thirds of them to replace staff who retire.
How Much European Delay Comes from Controller Staffing
EUROCONTROL codes every minute of en-route air traffic flow management (ATFM) delay with a cause. "ATC staffing" means fewer controllers were available on the day than planned. We compared the first nine months of each year so that 2026 can be measured against earlier years.
Source: AirAdvisor analysis of EUROCONTROL Aviation Intelligence Portal, en-route ATFM delay data by delay cause (EUROCONTROL area, Member States), January to September of each year, data to 30 September 2026.
Staffing delay in 2026 is running at 2.4 million minutes for January to September. That is below the 3.6 million minutes of 2018 and 2019, the years when Europe's controller shortage first hit hard, but well above the 1.4 million minutes of 2022. The total has barely moved since 2024 while traffic kept growing, so staffing has become a larger slice of a shrinking delay total. EUROCONTROL's Performance Review Commission traces the gap to reduced controller recruitment between 2010 and 2016, followed by COVID-era departures and training cuts.
Staffing Is Taking a Bigger Share of the Delay
Capacity delay (sectors that cannot be opened or handle more traffic) is often a staffing problem logged under a different code. The chart shows staffing on its own and both causes combined.
Source: AirAdvisor analysis of EUROCONTROL Aviation Intelligence Portal, en-route ATFM delay data by delay cause (EUROCONTROL area, Member States), January to September of each year, data to 30 September 2026.
Staffing alone has climbed from 12.0% of en-route delay in 2024 to 18.1% in 2026, and capacity and staffing together account for more than half of all en-route delay again. The real share is probably higher. In its 2025 report, the Performance Review Commission said adverse weather and ATC capacity are "erroneously presented" as bigger problems than staffing, and noted that several air navigation providers blocked a new delay code meant to flag staffing-driven capacity gaps. It also cites an estimate that controller staffing was around 5% below plan in 2023.
Summer 2026: Capacity and Staffing Still Lead
EUROCONTROL's end-of-summer briefing covers 1 June to 31 August 2026, the busiest stretch of the year. It splits en-route delay into four broad causes.
Source: EUROCONTROL, Special Flash Briefing, All-Summer 2026 Network Performance, 11 September 2026.
Capacity and staffing caused 1.28 of the 2.62 minutes of en-route delay per flight this summer, slightly more than severe convective weather (thunderstorms) at 1.12 minutes. Overall, summer delay fell 17% on 2025 and arrival punctuality improved to 72.6%, even with traffic up 2.4%. The hotspots were France, with 32% of all en-route delay so far in 2026, Spain with 17% and Greece with 12%. Spain's en-route delay was 14% higher than in 2025 and Greece's 57% higher, both linked by EUROCONTROL mostly to capacity and staffing. Of Europe's 68 area control centres, 13 looked set to miss the European capacity target for 2026. For the wider summer picture, see our peak travel season delay statistics.
Which Air Navigation Providers Generate Staffing Delay
Staffing delay is far more concentrated than other causes. This chart splits the 2026 staffing minutes by the air navigation service provider that applied the restriction.
Source: AirAdvisor analysis of EUROCONTROL Aviation Intelligence Portal, en-route ATFM delay data by delay cause (EUROCONTROL area, Member States), January to September of each year, data to 30 September 2026.
Two providers account for almost all of it. France's DSNA generated 45.9% of Europe's staffing delay and Greece's HASP 41.3%. Greece stands out because its share was 35% in 2024 and is now close to France's, even though France handles far more traffic. Germany's DFS, which produced 9% of staffing delay in January to September 2024, is down to under 3%. For passengers, the routes most exposed are those crossing French airspace or flying into Greek islands in summer. Our article on flight delays in the EU and UK shows how this feeds into late arrivals.
The US Controller Gap: Headcount vs Target
The FAA counts certified professional controllers (CPCs), the staff fully qualified to work every position at their facility. Its workforce plans set a national target and forecast how fast trainees will qualify.
Source: FAA, Air Traffic Controller Workforce Plan 2026-2028 (May 2026) and Air Traffic Controller Workforce Plan 2025-2028; forecast figures are FAA projections.
The number of certified controllers barely changed between September 2024 and September 2025, at about 10,700, even though the FAA hired 2,028 trainees in fiscal year 2025, its most since 2008. Trainees take two years or more to certify, and the FAA recorded 1,460 workforce losses in the same year. In May 2026 the FAA cut its target from 14,633 to 12,563, after lowering its controller availability factor from 2.14 to 1.87. It says better scheduling could raise time on position from about four to more than five hours per eight-hour shift.
The Facilities Furthest Below Target
National totals hide the worst gaps. The FAA publishes facility figures when it extends flight limits at the New York area airports, which gives a clear view of the busiest airspace in the country.
Source: FAA, Operating Limitations at Newark Liberty International Airport, and Staffing-Related Relief Concerning Operations at DCA, JFK and LGA, Federal Register, 23 June 2026; FAA, Air Traffic Controller Workforce Plan 2026-2028. The system-wide figure is AirAdvisor's calculation from approximately 11,000 CPCs against the 12,563 target.
New York TRACON, which handles approaches into JFK and LaGuardia, had 129 of 226 target controllers, or 57%. The FAA does not expect it to reach 70% before the end of 2027. Newark's airspace, now run from Philadelphia, was at 61%. Because of this, Newark stays capped at 36 arrivals and 36 departures an hour until 30 October 2027, and arrival on-time performance there was 75% even with the cap. These gaps go back years. A 2023 DOT Inspector General audit found 20 of 26 critical facilities below the FAA's 85% staffing threshold, with New York TRACON at 54% in March 2022.
The 2025 Shutdown: Staffing Shortages in Real Time
US controllers worked without pay during the government funding lapse in October and November 2025. From 7 November the FAA ordered airlines to cut flights at 40 high-impact airports, citing safety risks and delays from "air traffic controller staffing constraints".
Source: US Bureau of Transportation Statistics, Airline On-Time Statistics and Delay Causes, reporting carriers, October and November 2024 and 2025; FAA Emergency Order, Federal Register, 12 November 2025.
The share of flights delayed by the National Aviation System rose by 80% in October 2025, to 6.2% from 3.4% a year earlier. Cancellations rose in November, to 2.6% of flights from 0.5% in November 2024, the month the FAA flight cuts took effect. The reductions began at 4% on 7 November and reached 6% on 11 November. The FAA held them at 6% instead of the planned 10%, cut them to 3%, then cancelled the order on 17 November 2025. The FAA's workforce plan says the funding lapse also led to job declinations and trainee losses, which reach certified headcount later because training takes two years or more.
What US Airlines Report as Delay Causes
US airlines must assign a cause to every flight that arrives 15 minutes or more late. "Air carrier" covers problems the airline controls, such as crew, maintenance, cleaning and baggage loading. "National Aviation System" covers air traffic control, heavy traffic, airport operations and non-extreme weather.
Source: US Bureau of Transportation Statistics, Airline On-Time Statistics and Delay Causes, all reporting carriers, full calendar years.
Airline-caused delays peaked at 7.6% of all flights in 2022, as US airlines restored schedules after the pandemic, and have since eased to 6.6%. National Aviation System delays went the other way and reached 6.3% in 2025, the highest level in this comparison. Late-arriving aircraft, the knock-on effect of earlier delays, grew every year since 2022 and touched 8.0% in 2025. In the first eight months of 2026, airline-caused delays were back up at 7.0% of flights. Our airline delay recovery data shows how long those knock-on delays take to clear.
Ground Staff, Crews and the Turnaround
Airline and airport staff shortages show up in a different place: turnaround delays, including ground handling, boarding and crew issues, sit inside airline delay codes in both Europe and the US.
EUROCONTROL's Performance Review Commission says staffing shortages "across airports, airlines, and ATC" after the 2022 and 2023 rebound gave Europe its lowest punctuality in two decades. By 2025 the picture had improved. The average departure was 14.6 minutes late, down from 17.5 minutes in 2024, and airline delays, mostly turnaround and ground handling, fell by 13%. We found no regular official headcount of ground handling staff for Europe or the US, so delay codes are the best official measure of how these shortages reach passengers.
Pilots, Technicians and Cabin Crew: The Long-Term Need
Boeing's annual Pilot and Technician Outlook estimates how many new staff airlines will need over the next 20 years to fly and maintain the world's fleet. The 2026 edition covers 2026 to 2045.
Source: Boeing, Pilot and Technician Outlook 2026-2045, published July 2026 (forecast).
Boeing expects demand for 674,000 pilots, 728,000 maintenance technicians and 1,023,000 cabin crew, about 2.4 million people in all. Roughly two-thirds of them will replace staff who retire, and one-third will support fleet growth. North America alone needs 122,000 pilots and 191,000 cabin crew. Eurasia, which includes Europe, needs the most staff of any region. For more detail on pilots, see our pilot shortage statistics.
References and Sources
- EUROCONTROL, Aviation Intelligence Portal, en-route ATFM delay by delay cause and ANSP (ert_dly_ansp), 2018 to 2026, data to 30 September 2026, accessed 13 November 2026: ansperformance.eu
- EUROCONTROL, Special Flash Briefing, All-Summer 2026 Network Performance, 11 September 2026: eurocontrol.int
- EUROCONTROL, Special Flash Briefing, Summer 2025, September 2025: eurocontrol.int
- EUROCONTROL Performance Review Commission, Performance Review Report 2025, March 2026: eurocontrol.int
- EUROCONTROL, European Aviation Overview, 2025 review, 23 January 2026: eurocontrol.int
- Federal Aviation Administration, Air Traffic Controller Workforce Plan 2026-2028, 15 May 2026: faa.gov
- Federal Aviation Administration, Air Traffic Controller Workforce Plan 2025-2028: faa.gov
- FAA, Operating Limitations at Newark Liberty International Airport, Federal Register, 23 June 2026: federalregister.gov
- FAA, Staffing-Related Relief Concerning Operations at Ronald Reagan Washington National Airport, John F. Kennedy International Airport, and LaGuardia Airport, Federal Register, 23 June 2026: federalregister.gov
- FAA, Emergency Order Establishing Operating Limitations on the Use of Navigable Airspace, Federal Register, 12 November 2025: govinfo.gov
- FAA, revised Emergency Order (6 percent), Federal Register, 17 November 2025: govinfo.gov
- FAA, Cancellation of Emergency Order, effective 17 November 2025: faa.gov
- US DOT Office of Inspector General, FAA Faces Controller Staffing Challenges as Air Traffic Operations Return to Pre-Pandemic Levels at Critical Facilities, AV2023035, 21 June 2023: oig.dot.gov
- US Bureau of Transportation Statistics, Airline On-Time Statistics and Delay Causes, accessed 13 November 2026: transtats.bts.gov
- Boeing, Pilot and Technician Outlook 2026-2045, July 2026: boeing.com
- Boeing, press release, Boeing Forecasts $4.9 Trillion Commercial Aviation Support and Services Market and Demand for more than 2.4 Million New Aviation Personnel Over 20 Years, 17 July 2026: boeing.mediaroom.com
Methodology
European staffing figures come from EUROCONTROL's daily en-route ATFM delay data by delay cause, published on the Aviation Intelligence Portal. We used the "EUROCONTROL Area (MS)" total for network figures and the individual ANSP rows for provider shares. ATC staffing is delay code S; ATC capacity is code C. Because the 2026 data runs to 30 September and the 2025 file stops at 30 November, every year is compared on January to September. 2020 and 2021 are left out because COVID-19 cut traffic so sharply that delay figures are not comparable. Shares are AirAdvisor's calculations from minutes of delay. EUROCONTROL's own full-year 2025 figures (18.4 million minutes of en-route delay, 15.9% due to ATC staffing) are consistent with ours. Delay causes are assigned by the air navigation providers themselves, and EUROCONTROL's Performance Review Commission warns that staffing is likely under-reported. Summer 2026 cause shares are quoted from EUROCONTROL's briefing, which combines capacity and staffing in one category.
US controller numbers are certified professional controllers as reported in the FAA's workforce plans: on board on 21 September 2024 and 20 September 2025, and FAA forecasts for fiscal years 2026 to 2028. The system-wide share of target (87.6%) divides the FAA's figure of approximately 11,000 CPCs in April 2026 by the 12,563 target, so it is approximate. Facility shares are quoted from FAA Federal Register notices of 23 June 2026. US delay causes use the Bureau of Transportation Statistics on-time data for all reporting carriers; percentages are shares of all scheduled flights, and a flight counts as delayed when it arrives 15 minutes or more late. The shutdown comparison uses the same source for October and November of 2024 and 2025; the link between the shutdown and staffing comes from the FAA's emergency order, while the BTS data shows the pattern only. Boeing figures are forecasts. All figures are rounded.
