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From October 19, ten kinds of airline delay stop counting as the airline's fault in federal statistics, including unscheduled maintenance and medical emergencies. DOT's own rule says passengers will be offered fewer meals, hotels and credits as a result.

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A Transportation Department rule published September 3 takes effect October 19. It creates a new 'Section 511(b)' category in the monthly delay and cancellation reports airlines file, and moves ten causes out of the 'Air Carrier' category into it: among them unscheduled maintenance, a passenger medical emergency, removing an unruly passenger, cleaning after a passenger's death, cyberattacks and some government system failures. Congress required the change in the 2024 FAA reauthorization. The rule says that because airlines promise meals, hotels and sometimes compensation only for delays they control, 'the number of delays and cancellations for which air carriers provide amenities and compensation to consumers is expected to be reduced', and calls it 'a transfer of value from consumers back to air carriers'. It does not say how many flights are affected, and it says nothing about cash refunds for cancelled flights.

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When a flight is delayed or cancelled, the reason recorded matters to passengers in a way that is easy to miss. Airlines promise meals, hotel rooms and sometimes vouchers only when the delay is within their control. The code on the record is where that line is drawn.

On October 19 the line moves.

What changes

Airlines that report to the Transportation Department file a cause for every cancellation and every delay of 15 minutes or more. Since 2002 there have been five causes: the air carrier, extreme weather, the national aviation system, security, and a late-arriving aircraft.

The new rule adds a sixth, called "Section 511(b)," after the part of the 2024 FAA reauthorization law that required it. From the rule: "This final rule creates a new reporting category to capture these ten specific events," and those events "must not be reported as Air Carrier."

The ten, as the rule lists them:

  1. Aircraft cleaning required because a passenger died
  2. Aircraft damage from extreme weather, foreign object debris or sabotage
  3. A baggage or cargo delay from an outage of a bag system the carrier does not control
  4. A cyberattack, if the airline complies with applicable cybersecurity rules
  5. An unexpected shutdown or failure of a government system that affects safe operation
  6. Overheated brakes after a safety incident that required emergency procedures
  7. Unscheduled maintenance, including for an airworthiness directive, that cannot be deferred
  8. A medical emergency "through no fault of the carrier"
  9. Removing an unruly passenger
  10. An airport closure for volcanic ash, wind or wind shear

Several of these, including medical emergencies, unruly passengers, maintenance and cleaning, are currently listed as examples of airline-caused delays in the reporting guidance.

What it means for passengers, in DOT's words

The rule is plain about the effect. Every reporting airline that sells tickets commits in its customer service plan to amenities for long delays and cancellations it controls, and some add compensation. So:

the number of delays and cancellations for which air carriers provide amenities and compensation to consumers is expected to be reduced.

DOT describes that as "a transfer of value from consumers back to air carriers." It says it cannot estimate the size of the transfer, because it lacks "visibility into the frequency of the 10 delineated causes."

The case DOT makes for the rule is the airlines'. Counting these events as airline-caused, it says, is "overreporting" that gives carriers "negative reputational impacts and harm."

What it does not change

  • It says nothing about cash refunds. Your right to a refund when a flight is cancelled comes from a separate rule. This one does not mention it.
  • It does not change which airlines report. Thirteen carriers report for 2026; the rule does not name them.
  • It does not add a category for air traffic control instructions. The same law calls for one in section 511(a), and DOT leaves it to a future rulemaking with public comment.

What to know before you fly after October 19

Delay statistics and airline dashboards will show fewer delays as the airline's fault, partly because the definition changed rather than because the flying did. Comparisons of airlines' on-time records across October 2026 will mix old and new definitions.

DOT's own expectation is that fewer delays will qualify for what airlines' customer service plans promise. The rule does not stop an airline from offering more.

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