Last Updated on July 28, 2026 by Daniel Globe
Airline safety comparisons are easy to oversimplify. A raw accident count does not show how many flights an airline operated, how serious each event was, or whether the flight was operated by the mainline carrier or a regional partner. This guide compares Delta, American, and United using verified records and explains what the numbers can—and cannot—tell you before booking air travel.
Quick Answer
None of the FAA, NTSB, IATA, or ICAO publishes a current apples-to-apples ranking that proves Delta is safer than American or United. All three operate under the same U.S. Part 121 safety framework. Compare verified accidents, operator identity, severity, timeframe, and flights operated—not unsourced incident-rate claims.
Key Takeaways
- There is no official federal ranking that names Delta, American, or United as the safest of the three.
- A fair comparison needs the same event definition, time period, flight denominator, and operating-carrier scope.
- American Airlines Flight 5342 was operated by PSA Airlines, while the 2025 Delta Connection accident in Toronto was operated by Endeavor Air.
- Historical accidents remain useful for understanding safety improvements, but they do not prove a carrier’s current risk level.
- Commercial aviation remains very safe overall, although rare accidents can sharply change annual statistics.
What’s in This Article
- How to Read Airline Accident and Incident Rates
- Delta Air Lines Safety Record and History
- American Airlines Safety Record and History
- United Airlines Safety Record and History
- Delta vs. American vs. United: Safety Comparison
- What Causes Airline Accidents and Incidents
- How U.S. Airlines Reduce Safety Risk
- How Passengers Can Check an Airline’s Record
- The Future of Airline Safety
- Frequently Asked Questions
How to Read Airline Accident and Incident Rates
Incident rates matter only when the underlying data is comparable. The NTSB aviation database covers U.S. civil aviation accidents and selected incidents from 1962 onward. FAA systems also contain preliminary reports and other incident records. These databases are valuable, but they are not a ready-made consumer ranking of airlines.
Before comparing two carriers, check five details:
- Event definition: An accident, serious incident, runway event, turbulence injury, mechanical return, and voluntary safety report are not equivalent.
- Severity: A ground-damage event should not carry the same weight as a fatal accident.
- Exposure: Counts should be divided by flights, departures, flight hours, or passenger journeys using the same denominator.
- Time period: A one-year snapshot can swing sharply because airline accidents are rare. Multi-year periods are more stable.
- Operating carrier: A flight sold under a major airline’s brand may be operated by a separate regional airline.
Note: NASA’s Aviation Safety Reporting System contains voluntary, confidential reports. NASA warns that these reports are not independently verified and cannot be used to estimate how common a problem is.
IATA reported 51 accidents among 38.7 million flights in 2025—an all-accident rate of 1.32 per million flights. That is a global industry figure, not a ranking of Delta, American, and United.
Different organizations can publish different rates because they use different scopes and definitions. For example, IATA reported 1.32 accidents per million flights for 2025, while ICAO reported 2.2 accidents per million departures for scheduled commercial operations within its defined aircraft scope. Both can be accurate within their own methods.
Delta Air Lines Safety Record and Incident History
Delta Air Lines has a long operating history, so its record includes both major historical accidents and decades of later safety improvements. One of its most important cases was Delta Flight 191 on August 2, 1985. The Lockheed L-1011 encountered a severe microburst while approaching Dallas/Fort Worth International Airport. The accident became a major industry lesson in wind-shear detection, weather awareness, training, and approach decision-making.
The FAA’s Delta Flight 191 case study describes the rapid wind changes, downdrafts, and loss of airspeed during the encounter. The case should not be reduced to a vague claim about “pilot error,” because the accident involved severe weather hazards and system-wide lessons.
A more recent event occurred on February 17, 2025, when a CRJ-900 operated by Endeavor Air as Delta Connection struck the runway while landing in Toronto and came to rest upside down. The Transportation Safety Board of Canada reported 21 injured passengers and crew. Its investigation remained active in the February 12, 2026 update, so a final cause should not be stated until the final report is released.
These cases show why branding matters. The Toronto flight carried Delta’s brand, but Endeavor Air was the operating carrier. Any comparison must state whether it counts mainline Delta only or all Delta Connection operators.
American Airlines Safety Record and Incident History
American Airlines also has a long history that includes major accidents, later corrective action, and events involving regional affiliates. American Flight 191 crashed during takeoff from Chicago O’Hare on May 25, 1979, killing 271 people aboard and two people on the ground.
The NTSB found that maintenance-induced damage led to separation of the left engine and pylon assembly. The report also identified design vulnerabilities and weaknesses in oversight and information sharing. This is more precise than saying the accident happened only because of “improper maintenance.”
On January 29, 2025, a CRJ700 operated by PSA Airlines as American Airlines Flight 5342 collided with a U.S. Army helicopter near Ronald Reagan Washington National Airport. All 64 people aboard the airplane and all three people aboard the helicopter died. In January 2026, the NTSB said systemic failures in airspace design, safety oversight, and risk management contributed to the collision.
Flight 5342 is highly relevant to a current article, but it should not be presented as proof that American’s own pilots, maintenance program, or mainline fleet are less safe. The operating airline was PSA, and the NTSB’s findings centered on broader airspace and oversight failures.
United Airlines Safety Record and Incident History
United Airlines traces its history to the early years of U.S. commercial aviation. Its historical record includes United Flight 553, which crashed near Chicago Midway on December 8, 1972. The official investigation focused on flight management, airspeed deterioration, cockpit coordination, and the approach environment.
The accident helped reinforce the need for disciplined approach monitoring and better crew coordination. Those principles are now part of crew resource management, standardized procedures, simulator training, and safety-management systems across U.S. airlines.
United has also been involved in other influential safety cases, including Flight 173 in 1978 and Flight 232 in 1989. These events produced industry lessons about fuel-state awareness, cockpit teamwork, emergency management, and the value of using every available crew resource.
However, historical case studies do not create a current numerical rank. A defensible United comparison would require a defined period, verified event list, flight volume, severity weighting, and a clear decision about whether United Express operators are included.
Delta vs. American vs. United: Safety Comparison
No current official source supports the claim that Delta has 0.5 incidents per million flights while American and United have 0.7 or 0.8. Those figures should not be used without a named dataset, event definition, date range, operating-carrier rule, and flight denominator.
| Carrier | Verified context | Fair conclusion |
| Delta | Flight 191 shaped wind-shear safety lessons; the 2025 Toronto accident involved Endeavor Air and remained under investigation in early 2026. | The public sources reviewed do not establish a verified “safest of the three” rate. |
| American | Flight 191 exposed maintenance and oversight failures; Flight 5342 was operated by PSA and involved systemic airspace and oversight failures. | Recent tragedy matters, but it cannot be converted into a mainline American rate without a consistent method. |
| United | Historical cases produced important lessons in approach management, crew coordination, and emergency response. | A current rank requires the same verified numerator, denominator, period, and affiliate scope used for the other carriers. |
Warning: Do not choose an airline from a viral “accident count” graphic unless it identifies the source, dates, event definition, flight volume, and whether regional affiliates are included.
For most travelers, route, schedule, price, accessibility, and service will be more useful tie-breakers than an unsupported safety ranking. All three carriers and their Part 121 operating partners are subject to federal certification, surveillance, maintenance, training, and safety-management requirements.
What Causes Airline Accidents and Incidents
Airline accidents usually involve a chain of factors rather than one simple cause. Investigators examine aircraft systems, maintenance, weather, crew actions, air traffic control, airport design, organizational decisions, and regulatory oversight.
- Human and organizational factors: Communication, workload, fatigue, decision-making, training, procedures, and management systems can all affect risk.
- Aircraft or maintenance factors: Design weaknesses, component failures, incorrect procedures, inspection gaps, and documentation problems may contribute.
- Weather: Wind shear, icing, thunderstorms, turbulence, low visibility, and contaminated runways can make takeoff and landing more difficult.
- Airspace and runway risks: Traffic conflicts, runway incursions, confusing airport layouts, and controller workload can create hazards.
- External events: Bird strikes, ground-equipment collisions, foreign-object damage, and unlawful interference require different prevention strategies.
Note: Aircraft age alone does not show whether a plane is unsafe. Airworthiness depends on approved maintenance, inspections, repairs, operating limits, and regulatory compliance.
How U.S. Airlines Reduce Safety Risk
U.S. scheduled airlines operate under layered safety controls. The FAA requires Part 121 operators to implement a Safety Management System. An SMS gives an airline a formal process for identifying hazards, assessing risk, checking whether controls work, and improving safety over time.
Other safeguards include:
- recurrent pilot, dispatcher, mechanic, and cabin-crew training;
- crew resource management and standardized cockpit procedures;
- continuous airworthiness maintenance programs and required inspections;
- flight-data monitoring and voluntary reporting programs;
- weather radar, terrain awareness, collision-avoidance, and runway-safety systems;
- independent accident investigations and corrective recommendations.
No layer is perfect by itself. Aviation safety improves when airlines, manufacturers, airports, regulators, air traffic services, and crews share data and act on weak signals before they become accidents.
How Passengers Can Check an Airline’s Safety Record
Start with official records instead of a general web ranking. Search the operating carrier’s legal name in the NTSB database, then read the investigation page or final report for each serious event. Check whether the event was an accident, a selected incident, or only a preliminary report.
- Identify the operating carrier. Look for “operated by” on the booking page or confirmation.
- Set a meaningful period. Ten years is usually more informative than one year for rare events.
- Separate fatal accidents from minor incidents. Do not combine them into one unweighted count.
- Use a denominator. Compare events per flight or departure when reliable traffic data is available.
- Read the cause and status. Preliminary information can change, and an ongoing investigation has no final probable cause.
- Check the source’s scope. Confirm whether regional affiliates, cargo operations, charter flights, or predecessor airlines are included.
Pro Tip: Search both the marketing name and the operating airline. A ticket labeled Delta Connection, American Eagle, or United Express may be flown by a separate Part 121 carrier with its own certificate and record.
Also remember that a strong safety culture can increase internal reporting. A carrier that records more near-misses may be finding and correcting hazards rather than operating less safely. Voluntary report totals should never be treated as verified accident rates.
The Future of Airline Safety
Future gains will come from better use of data, stronger runway protections, improved airspace design, and faster action on known hazards. Airlines and manufacturers increasingly use aircraft-health data to identify abnormal trends before a component fails, but predictive tools still depend on good sensors, maintenance judgment, and clear procedures.
Training will continue to use high-fidelity simulators for rare emergencies, upset recovery, weather events, and crew coordination. Regulators are also expanding safety-management practices beyond airlines so that manufacturers and other aviation organizations manage risk through a common framework.
Recent global data shows why long-term context matters. IATA reported a lower overall accident rate in 2025 than in 2024, while fatalities rose because a small number of severe accidents accounted for most lives lost. ICAO likewise reported fewer accidents and fatal accidents in 2025 but more total fatalities. Safety can improve overall even when a single year includes devastating events.
Frequently Asked Questions
Which is safer: Delta, American, or United?
No current FAA, NTSB, IATA, or ICAO publication provides a directly comparable ranking that proves one of these three is safest. A valid comparison would need the same event definition, period, flight denominator, severity rules, and regional-affiliate scope.
Why are simple airline accident counts misleading?
Large airlines operate more flights, so they have more exposure. Counts can also mix fatal accidents, minor ground events, turbulence injuries, and regional-affiliate flights. Compare rates built from consistent definitions instead of raw totals.
Does an older aircraft mean an airline is less safe?
Not by itself. Aircraft must remain airworthy through approved maintenance, inspections, repairs, and operating controls. Maintenance quality and regulatory compliance are more meaningful than calendar age alone.
Was American Airlines Flight 5342 operated by American?
It was marketed as American Airlines Flight 5342 but operated by PSA Airlines. The NTSB said systemic failures in airspace design, FAA and U.S. Army oversight, and risk management contributed to the January 29, 2025 collision.
What happened to the Delta Connection flight in Toronto?
On February 17, 2025, an Endeavor Air CRJ-900 operating as Delta Connection struck the runway during landing and came to rest upside down. The TSB reported 21 injuries. Its February 2026 update said analysis was still underway.
How can I verify an airline’s safety history?
Use the NTSB Aviation Investigation Search for U.S. accidents and selected incidents, the FAA’s accident and incident resources, and the responsible foreign investigation authority for events outside the United States. Always check whether a report is preliminary or final.
Safety Disclaimer: This article provides general information, not a guarantee about any airline or flight. Safety records and investigation findings change over time. Review current information from the responsible aviation authority before making a decision based on safety data.
Delta, American, and United all operate within a highly regulated aviation system, but no airline is risk-free. The most honest comparison is not a dramatic league table. It is a careful review of verified events, exposure, severity, operating-carrier identity, investigation status, and the safety lessons that followed.
Sources
- NTSB Aviation Investigation Search — official U.S. accident and selected-incident records from 1962 onward.
- FAA Safety Management System for Part 121 Operators — federal SMS requirements for scheduled air carriers.
- IATA 2025 Safety Report release — global accident rates, flight totals, and fatality-risk context.
- ICAO 2025 global aviation safety data — scheduled commercial aviation accident and fatality trends.
- NTSB final board findings on Flight 5342 — operating carrier, fatalities, systemic findings, and recommendations.
- Transportation Safety Board of Canada investigation A25O0021 — Delta Connection Toronto occurrence and investigation status.