Cirium
Cirium, a London company, collects and cleans aviation data from more than 2,000 sources, covering schedules, flight status, fleets and aircraft values, and sells it to airlines, airports, lessors and travel firms.
With more than 400 staff, it owns FlightStats real-time tracking, Diio market data, the Fleets Analyzer database and Ascend, whose consultancy issues independent aircraft valuations. It tracks flights over oceans through its partnership with Aireon, and its on-time performance rankings are widely cited. Its predictive models cover aircraft values and maintenance events.
No verified deployments yet
Cirium is profiled in the companies register, but no deployment has been verified against published evidence. Records are added as evidence is reviewed and graded.
Products & Solutions
10 productsThe Cirium Core
The Cirium Core is the foundational data platform underpinning all Cirium products. It processes more than 300 terabytes of aviation data daily from over 2,000 curated sources, normalising and storing data for rapid retrieval.
Eliminates reliance on a single data source and closes data integrity gaps in aviation analytics by fusing and normalising data from thousands of sources, providing a unified, high-quality base for all downstream products and customer applications.
- Processes over 300 terabytes of aviation data daily
- Ingests and normalises data from over 2,000 curated sources
- Creates connections across disparate datasets enabling unlimited analytical combinations
- Uses Aireon ADS-B satellite data for near real-time aircraft tracking and status validation
3 more features
- Multiple redundant data sources to identify outliers before they reach customers
- Underpins all Cirium commercial product suites
- Over 20 years of historical market data on valuations, fleets, and individual aircraft
Technical specifications (4)
- 300+ terabytes processed daily
- 2,000+ normalised data sources
- Aireon ADS-B integration for real-time aircraft positioning
- Near real-time data refresh cadence
Cirium Ascend
Cirium Ascend is a suite of aircraft analytics products providing a 360-degree view of aircraft assets, past, present, and future. The suite covers fleet data, aircraft valuations, maintenance tracking, utilisation, CO2 emissions, and airline/lessor profiles.
Provides aviation finance, leasing, insurance, MRO, OEM, and airline fleet planning stakeholders with comprehensive, independently verified aircraft data and valuations to support financial risk management, investment strategy, asset management, and market growth decisions.
- 360-degree view of aircraft assets across fleet, values, maintenance, utilisation, and CO2 emissions
- Over 450,000 unique aircraft records across 770+ aircraft types
- Over 300 attributes per aircraft and over 2.8 million aircraft events going back to the 1950s
- Satellite-based flight tracking via Aireon for near 100% commercial aircraft coverage
6 more features
- Independent aircraft valuations from the industry's largest ISTAT and ASA Certified Appraiser team
- Sophisticated modelling: lease encumbered, maintenance adjusted, distressed, and future residual values
- Highly visual and interactive airline and lessor profiles
- CO2 emissions module integrated with satellite tracking data
- Growing Electric and Advanced Air Mobility (AAM) aircraft data
- 24/5 customer support with 90%+ satisfaction score
Technical specifications (7)
- 450,000+ unique aircraft records across 770+ types
- 300+ attributes per aircraft
- 2.8 million+ aircraft events
- Integrated Aireon satellite tracking for tracked hours and cycles
- 2,700+ new aircraft data updates per week
- Optimised for desktop, mobile, and tablet
- Values available per month going back/forward 11 months
- ISTAT Certified Appraisers (largest team in industry)
- ASA Certified Appraisers
- Named Appraiser of the Year 2026 at Airline Economics Aviation 100 Global Leaders Awards (fourth consecutive year)
FlightStats
FlightStats is Cirium's real-time flight tracking and on-time performance API platform. It provides flight status, airport status, schedules, ratings, delay index, and weather information for commercially scheduled flights globally.
- Real-time flight status and positional data
- Airport status, schedules, airline reference data
- Ratings and delay index
- Push-based Flight Status Stream API
2 more features
- Trip alert services for traveller disruption management
- Multi-language API responses (8 languages)
Technical specifications (1)
- REST API. Supports JSON, JSONP, XML, SOAP. Push-based Flight Status Stream. Multi-language: English, Simplified Chinese, Japanese, German, Spanish, French, Portuguese, Arabic.
Cirium Diio
Cirium Diio is the leading airline analytics platform providing end-to-end schedule and planning intelligence for airlines, airports, travel providers, tourism organisations, governments, and financial institutions.
Enables airlines, airports, and travel ecosystem players to research markets, plan and optimise routes, forecast demand, track competitive schedules, and build data-driven cases for new air services, using the most comprehensive historical and forward-looking schedules, fares, and booking data available.
- Global schedules coverage: 97%+ of worldwide flights, 20 years historical, 11 months forward
- 99.6% coverage of scheduled Available Seat Kilometres (ASKs)
- Multi-GDS advance bookings data updated weekly
- Fare and load factor data for US flights; fare and demographic data for global airports
7 more features
- QSI forecasting for route revenue and profitability analysis
- Dynamic custom report builder with .XLS and .CSV export and email delivery
- SRS Analyser: real-time schedule data validation for 924 airlines
- Diio Advance Bookings: past, present, and future booking trends and traveller intent
- Diio Schedule Snapshot: historical schedule accuracy and yield benchmarking
- Cirium Scenario Planner (add-on): simulate route scenarios using historical traffic and schedules
- Market Alerts: custom schedule change notifications by email
Technical specifications (8)
- 97%+ global scheduled flight coverage
- 99.6% ASK coverage
- 20 years historical schedules (back to 2003 for Diio Mi)
- 40 years historical for SRS Analyser
- Weekly data updates
- 924 airlines in SRS Analyser
- 900+ airlines schedules in suite
- Multiple output formats: .XLS, .CSV, scheduled email delivery
On-Time Performance Reports
Cirium publishes monthly and annual On-Time Performance (OTP) reports covering airline and airport on-time performance globally. These reports are the industry-standard benchmark for OTP data, referenced by media, airlines, and airports.
- Monthly and annual global OTP rankings by airline and airport
- Industry-standard benchmark data
- Publicly available reports, free to access
- Powers Google flight search data
Cirium Fleets Analyzer
Cirium Fleets Analyzer is the industry's most flexible and comprehensive fleet analysis solution, part of the Cirium Ascend suite. It provides a 360-degree view of the global aircraft fleet with satellite-based tracking, CO2 emissions monitoring, and deep analytical tools for fleet, financial, and sustainability decisions.
Gives banks, lessors, OEMs, MROs, airlines, and airports a single source for comprehensive aircraft fleet intelligence, including ownership, utilisation, maintenance events, values, and CO2 emissions, to support trading, portfolio management, financial risk assessment, and sustainability reporting.
- Largest fleets database: 450,000+ unique aircraft records across 770+ types
- 300+ attributes per aircraft; 2.8 million+ events going back to the 1950s
- Integrated Aireon satellite-based tracking for independent global utilisation coverage
- CO2 emissions module with fuel burn data per aircraft and engine type
7 more features
- Highly visual interactive airline and lessor profiles
- Custom filters for 100+ groupings (MSN, operator, lessor, type, country)
- Saved searches and portfolio alerts
- Preconfigured searches built by Ascend Consultancy experts
- Growing Electric and Advanced Air Mobility (AAM) data
- 24/5 support with 90%+ satisfaction score
- 2,700+ weekly aircraft data updates from 30+ person data team
Technical specifications (7)
- 450,000+ unique aircraft records
- 770+ aircraft types
- 300+ attributes per aircraft
- 2.8 million+ aircraft events
- Aireon ADS-B satellite integration for ~100% commercial fleet coverage
- Optimised for desktop, mobile, and tablet
- 2,700+ new aircraft data updates per week
Cirium Sky
Cirium Sky is a suite of data delivery and API products giving businesses machine-readable access to Cirium's aviation analytics through cloud warehousing, real-time streaming, and API connections.
Enables airlines, airports, travel enterprises, OEMs, and technology vendors to embed Cirium's comprehensive aviation data directly into their own systems and workflows without managing data acquisition and normalisation infrastructure.
- Cirium Sky Warehouse: bulk historical and forward-looking aviation data via cloud (Snowflake, AWS Redshift)
- Cirium Sky Stream: real-time integrated flight feed fusing flight status, aircraft identifiers, and satellite positional data
- Cirium Sky API: on-demand API for flight status, tracking, CO2 emissions, flight alerts, weather, fleet inventories, NOTAMs
- Cirium Sky API, Emissions: forecast CO2 per flight/seat at booking for pre-travel emissions transparency
6 more features
- 99.5% coverage of scheduled passenger flights
- Gapless commercial aircraft coverage via Aireon ATG-grade satellite ADS-B
- IATA SSIM industry-standard schedule file delivery option
- Cirium Developer Studio for API exploration and integration
- Historical fares and traffic analysis via warehouse
- Query capability for large-volume portfolio utilisation and past flight data
Technical specifications (7)
- Cloud integrations: Snowflake Computing, AWS Redshift
- Delivery modes: Warehouse (cloud), API, Stream, File (SSIM)
- IATA SSIM format support
- File delivery frequency: daily, weekly, monthly, quarterly, or ad-hoc
- Aireon satellite ADS-B (ATG-grade) for real-time positioning
- 1.1 million updates per hour (EmeraldSky/emissions data)
- 600+ diverse data sources
Cirium Dashboard
Cirium Dashboard is a single-source web application for aviation news, data analysis, and insights.
Provides aviation professionals with a unified, constantly updated intelligence hub combining news, fleet data, airline financials, route capacity, and market analysis, replacing the need for multiple disparate sources for daily industry monitoring and strategic planning.
- 300,000+ news and analysis stories since January 1995 from an in-house editorial team
- Organisational data on 8,700+ companies including airlines, airports, and MROs
- Fleet figures for 1,700+ airlines
- Airline financial results and fleet summaries
5 more features
- Route capacity analysis between airport, country, or region pairs
- Breaking news alerts and custom news alert emails
- Weekly Editor's Pick report and monthly regional Airline Market Reviews
- Pre-built reports and analysis with current data
- Aircraft orders, fleet information, and airline finances for every global commercial airline
Technical specifications (2)
- Web-based application
- Available as standalone or as part of Fleets Analyzer and Ascend Profiles access
Cirium Ascend Consultancy
Cirium Ascend Consultancy is a professional advisory and aircraft valuation service with over six decades of experience (formerly Ascend by Cirium).
Provides financially binding, independent aircraft valuations and aviation market intelligence for deal-making, portfolio risk assessment, investor strategy, restructuring, and regulatory submissions, backed by the deepest proprietary dataset and longest-tenured appraisal team in the industry.
- Thousands of independent valuations and reports annually
- Valuations: lease encumbered, maintenance adjusted, distressed, future residual, half-life, full-life, base, and current market values
- Risk and pricing models
- Lease reviews, maintenance reserve adequacy analysis, and fly-forward analysis
8 more features
- Market development and exit strategy studies
- Fleet forecasts and airline credit assessment
- Expert witness cases
- Helicopter, business jet, simulator, cargo, and emerging aircraft type valuations
- Airport planning and design advisory
- Airline and airport strategic planning
- Named Appraiser of the Year 2026 (fourth consecutive Airline Economics Aviation 100 award)
- Bespoke projects plus purchasable industry reports and market commentaries
Technical specifications (4)
- 20+ years of historical valuations data via Cirium Core
- 1,600+ lines of market activity data captured annually
- Values for 500,000+ aviation assets annually
- Global offices including Heathrow, New York, Hong Kong, and London
- ISTAT Certified Appraisers (largest team in industry)
- ASA Certified Appraisers
- Appraiser of the Year 2026, Airline Economics Aviation 100 Global Leaders Awards (fourth consecutive year)
EmeraldSky
EmeraldSky is Cirium's branded emissions data product and methodology, described as aviation's premier independent source of flight and aircraft CO2 emissions data. It delivers accurate historic and forecasted CO2 emissions and fuel consumption at the aircraft, flight, seat, and cargo level.
Provides airlines, airports, travel companies, lessors, and financial institutions with the most accurate, independently verifiable CO2 and fuel burn data for sustainability reporting, carbon reduction strategy, booking-level emissions disclosure (EU regulations), portfolio emissions monitoring, and aviation NetZero 2050 planning.
- Historic and forecasted CO2 emissions and fuel consumption per flight, aircraft, seat, and cargo
- Methodology accounts for aircraft model, engine type, aircraft age, flight duration, passenger count, and cargo capacity
- 900+ airline schedules updated 280,000 times daily
- Real-time data from 600+ sources including Aireon ATG-grade satellite ADS-B
6 more features
- 1.1 million data updates per hour
- 475,000+ aircraft across 770 types and 300+ attributes per aircraft
- Enables pre-booking CO2 estimates via Cirium Sky Emissions API
- Scenario modelling: compare emissions of replacing old aircraft with newer, more fuel-efficient types
- Published methodology documentation (2025 edition available)
- Independently commended by American Airlines (AA) and Virgin Atlantic (VS) for accuracy
Technical specifications (6)
- 600+ data sources for real-time flight data
- Aireon ATG-grade satellite ADS-B integration
- 1.1 million data updates per hour
- 280,000 schedule updates daily across 900+ airlines
- 475,000+ aircraft records
- Published methodology: EmeraldSky Flight Emissions Methodology Documentation 2025
Register notes
Notes held in the Aerostack register. Aerostack has not independently verified them.
2025 partnerships: Copenhagen Airport + Azinq (operational intelligence); ACI ASQ (airport service quality data); Condor (schedule and fleet analytics).
Earlier listing summary (3 groups)
Summary text from the earlier Aerostack listing. Figures in it are not independently verified.
- Aviation data aggregation from 2,000+ sources
- 97% global scheduled flight coverage
- 300+ terabytes processed daily
- Real-time tracking via satellite ADS-B (Aireon partnership)
- 20+ years historical schedule data
- 480,000+ aircraft records with 400+ datapoints each
- Airlines: OTP benchmarking against competitors
- Lessors: Aircraft utilisation and maintenance tracking
- Banks: Portfolio risk assessment
- Travel companies: IROPS rebooking management
- 99%+ commercial flight coverage claimed
- Majority of top 100 airline groups use Cirium data
- Ascend Consultancy: Airline Economics Appraiser of the Year ten times
- OTP rankings widely cited in aviation media
Profile data from the Aerostack companies register; deployment records from the verified register. Evidence grades: T1 first-party confirmation, T2 credible reporting. See Our approach for how records are graded.