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. 
• Too see the changes you will need to hard refresh your browser using Ctrl + F5 or Ctrl + fn + F5.

Update overview

Cirium has made 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 were 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 has now been retired and replaced by the new data set. Historical reported utilization has been 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 has been 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.

Will any other products be effected?

In addition to Fleets Analyzer, reported utilization will be replaced by the new data set in Values Analyzer, Profiles and Asset Watch.

If you have any further questions, please reach out to helpdesk@Cirum.com.

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