We updated our model to include March 2026, and here’s how the data appears. Browse the four pages and use the menus to select routes you fly. The results will show how the airlines are performing.
Schedule padding (also known as “block padding” or schedule buffering) is the practice of deliberately adding extra time to a flight’s published duration relative to its actual, optimal airborne time. If a flight realistically takes 2 hours from gate to gate under perfect conditions, an airline might list it in the schedule as 2 hours and 20 minutes.
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Why Airlines Pad Schedules
Commercial aviation operates on tightly integrated, sequential networks. A delay on an early-morning flight can ripple across the country, disrupting dozens of subsequent legs. Indeed, the data shows that once an airline ‘loses schedule integrity’ – typically by 1 pm, it never manages to capture the lost time until the midnight reset.
Padding acts as a shock absorber for several variables:
- Airport Congestion: Air traffic control (ATC) holds, runway queues, and ground taxi bottlenecks (especially at hubs like JFK, ORD, or LAX) add unpredictable minutes.
- Weather and Headwinds: Seasonal jet streams can significantly alter flight times. Eastbound flights are often faster due to tailwinds, while westbound flights require more padding.
- The On-Time Performance (OTP) Metric: In major markets, regulatory bodies (like the US Department of Transportation) publicly track and rank airlines on their on-time performance—defined as arriving within 14 minutes of the published schedule (A14). Padding helps protect these critical marketing and regulatory metrics.
The Economic and Operational Trade-Offs
While padding protects the schedule, it introduces structural costs that network planners must constantly balance.
| The Benefits of Padding | The Structural Costs |
| Higher OTP: Improves customer satisfaction and brand loyalty via better on-time rankings. | Reduced Aircraft Utilization: Minutes spent sitting on the ground cannot be scheduled for additional revenue flights, thereby lowering daily frame utilization. |
| Lower Misconnection Rates: Protects passenger and baggage itineraries at hub airports, reducing re-booking and hotel costs. | Increased Crew Costs: Crew labor contracts are paid based on block time; padding artificially increases guaranteed payroll hours. |
| Buffer Recovery: Allows a late-departing aircraft to “make up time” in the air on paper, resetting the aircraft’s schedule for the next leg. | Passenger Friction: Passengers may spend more time sitting on the tarmac or arriving “early” only to find their arrival gate occupied by another aircraft. |
It’s an ongoing tradeoff – and just to be clear, airline benefit is priority #1. If you doubt that, read the Contract of Carriage for a reality check. Airline revenue is fixed – once you’ve paid, that’s it. Airline costs continue to pile up as long as the block time is ‘live’. Therefore, an airline will aim to reduce costs wherever possible.
But as the model shows you, rational behavior is not what you should expect. Airline economic logic is unlike any other logic. Even with the most powerful IT tools and petabytes of data, we see things airlines do that don’t make sense.
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