ACCIDENT COUNTS CANNOT BE USED ALONE
By OffRoadPilots
During the 109 complete months from August 2016 through August 2025,
the combined dataset records 1,269 commercial aviation accidents in
Canada and the United States. Of these, 625 occurred in Canada and 644
occurred in the United States. This represents a remarkably even
geographical distribution: approximately 49.3 percent occurred in Canada
and 50.7 percent in the United States. The combined average was
approximately 11.6 commercial accidents per month. These figures should
not be interpreted as accident rates because the workbook does not
contain exposure data such as departures, flight hours, passenger miles,
aircraft movements, or commercial fleet utilization. They measure
occurrence frequency only.
Commercial aviation represented approximately 9.8 percent of the 12,965
total aviation accidents recorded across the combined dataset during
these 109 months. General aviation therefore accounts for the substantially
larger portion of accident frequency. However, commercial aviation
remains operationally important because individual commercial accidents
can expose more occupants, employees, passengers, customers, cargooperations, and members of the public to consequences. Accident
frequency alone therefore provides an incomplete measure of commercial
aviation risk. Safety management should examine both how often
accidents occur, and the potential severity associated with individual
events.
The monthly distribution demonstrates considerable variability rather than
a stable fixed number of commercial accidents. The highest monthly total
in the comparable period occurred in July 2019, with 26 commercial
accidents. August 2023 recorded 25, May 2017 and July 2017 each
recorded 24, August 2024 recorded 23, and July 2025 recorded 22. Several
of the higher-frequency months occur during the summer operating
season. This pattern deserves attention, although the dataset alone cannot
establish causation. Increased seasonal flying, aerial work, flight training,
tourism, wildfire-related operations, agricultural activity, remote operations,
weather exposure, and higher aircraft utilization could influence summer
frequency. Exposure information would be required before concluding that
summer operations have a higher accident rate.
Fatality information
demonstrates why
frequency, and severity
must be analyzed
independently. Across the
comparable period,
commercial aviation
accidents resulted in 475
recorded fatalities: 191
associated with Canadian
commercial accidents and
284 with United States commercial accidents. The monthly average was approximately 4.4 commercial aviation fatalities, but this average is strongly affected by relatively infrequent high-consequence events.
A month with numerous accidents can have comparatively few fatalities,
while a month with fewer accidents can produce a substantial fatality total.
January 2025 is the clearest example in the workbook, with 14 commercial
accidents but 73 fatalities. July 2019 recorded 26 commercial accidents
and 36 fatalities.
This variability demonstrates a central principle for Safety Management
Systems: accident counts cannot be used alone as the measure of safety
performance. A declining number of accidents does not automatically
establish that underlying operational risk is declining. Conversely, an
increase in reported occurrences does not necessarily mean the system
has become proportionately less safe. Safety performance must consider
severity, exposure, operational context, precursor events, hazards,
effectiveness of risk controls, and whether adverse trends represent
common-cause or special-cause variation.The annual figures also illustrate fluctuation. The dataset records 170 commercial accidents in 2017, 132 in 2018, 158 in 2019, 107 in 2020, 127 in 2021, 126 in 2022, 139 in 2023, and 144 in 2024.
The 2020 reduction is
particularly notable but should not automatically be interpreted as an
improvement in system safety because aviation activity was substantially
disrupted during that period. Without normalizing accident numbers
against commercial activity, conclusions concerning improvement or
deterioration would be unreliable. The appropriate question is not simply
how many accidents occurred, but how many occurred relative to the
amount and type of aviation activity conducted.
The data provides valuable
strategic information.
Commercial accident
frequency persists
throughout the entire period
rather than disappearing as
technology, regulation,
aircraft reliability, training
systems, and safety
programs evolve. This
reinforces the principle that aviation safety is a continuously managed
process. Past safety performance does not guarantee future performance.
Each accident represents evidence that combinations of hazards, operational conditions, human factors, organizational factors, technical failures, environmental conditions, or ineffective defenses can still
penetrate the aviation system.
For commercial operators, the strongest application of this dataset is
therefore proactive and predictive Safety Management System analysis.Operators should not wait for an accident before identifying deterioration.
Flight operations, maintenance control, dispatch or flight following, ground
operations, training, fatigue management, weather decision-making,
runway events, unstable approaches, rejected takeoffs, diversions,
mechanical interruptions, loading errors, towing events, near misses, and
procedural deviations can provide leading information long before they
contribute to an accident. Trending these indicators monthly can reveal
changes that accident statistics alone cannot detect.
The combined data shows a commercial aviation system with relatively low
accident frequency compared with the total aviation accident population,
but with continuing exposure to occasional high-severity outcomes. The
principal safety lesson is therefore not that commercial aviation is either
becoming safe or unsafe based on monthly totals. Rather, commercial
safety requires continuous monitoring of frequency, severity, exposure, and
precursors.
A Safety Management System should investigate significant monthly
variation, identify special-cause changes, determine organizational and
operational root causes where appropriate, and verify corrective actions
through Safety Assurance. The objective should be continuous control of
risk rather than achievement of an assumed final state of safety. Canada
and the United States have mature aviation systems, but this dataset
demonstrates that commercial aviation safety remains dynamic. Effective
SMS programs must therefore continually learn from accidents while
placing greater emphasis on detecting the conditions that precede them,
allowing organizations to intervene before those conditions develop into
the next serious or fatal accident.
OffRoadPilots
