Key changes:
- New data set: combines historical reported utilization with contemporary tracked utilization where this was possible.
- Retirement of Reported Utilization: reported utilization will be retired and replaced by the new data set.
- Preservation of Historical Data: All historical reported utilization will be preserved in the new data set and visible under new column headings.
- Effective Date: The last date for reported utilization for any aircraft is June 2024. After this date, the data will be blended with tracked data for more timely and enhanced coverage.
Update overview
On the 15th of April Cirium is making changes to improve the coverage and accuracy of cumulative aircraft utilization data points, associated calculated statistics, and usage of this data to project aircraft utilization, within the Fleets Analyzer Projection tab.
These improvements are made possible through the creation of a new utilization data set that blends historical reported utilization with contemporary tracked utilization. The two data sets complement each other to provide the industry’s most accurate view of an aircraft’s lifetime utilization.
As part of this change reported utilization will be retired and replaced by the new data set. Historical reported utilization will be incorporated into the new data set and visible in product under the new column headings (see table at end of article). Where possible, reported and tracked utilization will be blended from the last reported date, this date will vary from on a case-by-case basis. The date at which data is blended can be found in the column ‘Reported Hour & Cycles Date’.
Why is the new data set better than Reported?
Cumulative utilization (an aircraft’s total flight hours and flight cycles over it’s lifetime) currently relies on reported utilization data.
As of Q1 2025, reported utilization covers only ~50% of the in-service commercial fleet, including only 40% of commercial operators. Due to ongoing reporting and acquisition challenges, when available, the data suffers from a three-month lag. This mean for ~50% of the in-service commercial fleet cumulative utilization is not being gathered.
To address this issue, we have combined the historical reported utilization with tracked utilization; which covers 99% of the in-service commercial fleet with a lag of one-day. Following the last reported utilization date for an aircraft, the data is switched to tracked utilization, meaning we can continue adding data to an aircraft’s cumulative utilization without relying on data being reported by the aircraft OEM or operator.
How will the new data set effect the Projections Tab?
With blended utilization, the number of aircraft with up-to-date cumulative utilization will increase by ~40,000 or 147%. The increase will impact utilization projections for many aircraft in Fleets Analyzer, as the projection logic has more data to work with. Expect to see changes, however they represent the improved accuracy and coverage of the data.
When should I use the new data set and when should I use Tracked?
Tacked is still the recommended data set for queries that are not related to an aircraft’s cumulative utilization, as the new data set will only blend reported and tracked data if there is a no gap (that cannot be explained by an aircraft event e.g. storage) between the last reported date and the next tracked date.
For some aircraft there is a gap, in such case the data is not blended as the result would not be a true reflection of the aircraft’s lifetime utilization.Therefore for to view annual, last 12 month, monthly, period utilization data tracked utilization still provides the industry’s more accurate and complete data.
When will these changes take place?
The update will be visible on April 15th.
If you have any further questions, please reach out to helpdesk@Cirum.com.
Column header name changes from reported to new data set
Further reading:
- https://helpdesk.cirium.com/s/article/11085378046747-What-is-the-difference-between-Tracked-vs-Reported-Utilization
- https://helpdesk.cirium.com/s/article/29132226548507-Why-have-the-Tracked-Utilisation-metrics-changed
- https://helpdesk.cirium.com/s/article/9699035704603-How-often-is-tracked-aircraft-utilisation-data-in-Fleets-Analyzer-updated-what-is-the-coverage-and-what-are-the-sources
- https://helpdesk.cirium.com/s/article/360027576112-How-often-is-reported-aircraft-utilisation-data-in-Fleets-Analyzer-updated-what-is-the-coverage-and-what-are-the-sources
Column header changes in Fleets Analyzer
| Old | New |
| Average Annual Reported Cycles | Average Annual Cycles |
| Average Annual Reported Hours | Average Annual Hours |
| Average Cumulative Reported Cycles | Average Cumulative Cycles |
| Average Cumulative Reported Hours | Average Cumulative Hours |
| Average Daily Reported Utilisation | Average Daily Utilisation |
| Average Period Reported Cycles | Average Period Cycles |
| Average Period Reported Flight Time | Average Period Flight Time |
| Average Period Reported Hours | Average Period Hours |
| Average Reported Flight Time | Average Flight Time |
| Average Reported Flight Time With Operator | Average Flight Time With Operator |
| Cumulative Reported Cycles | Cumulative Cycles |
| Cumulative Reported Cycles With Operator | Cumulative Cycles With Operator |
| Cumulative Reported Hours | Cumulative Hours |
| Cumulative Reported Hours With Operator | Cumulative Hours With Operator |
| Previous 12 Months Average Daily Reported Utilisation | Previous 12 Months Average Daily Utilisation |
| Previous 12 Months Reported Cycles | Previous 12 Months Cycles |
| Previous 12 Months Reported Hours | Previous 12 Months Hours |
| Previous Month Reported Cycles | Previous Month Cycles |
| Previous Month Reported Hours | Previous Month Hours |
| Total Cumulative Reported Cycles | Total Cumulative Cycles |
| Total Cumulative Reported Hours | Total Cumulative Hours |
| Total Period Reported Cycles | Total Period Cycles |
| Total Period Reported Hours | Total Period Hours |
| Total Period Reported Utilisation Aircraft | Total Period Utilisation Aircraft |
