Where to get the real reason for your delay
The airline's gate agent or customer service line can tell you the official reason your flight was delayed. Call the airline directly using the number on your booking confirmation, or ask at the airport counter. The airline categorizes delays into a few standard buckets: mechanical issues with the aircraft, weather, air traffic control decisions, crew problems, or what they call "operational reasons" (which can mean anything from a late-arriving plane to a passenger medical issue).
The reason matters because it determines what you're owed. In the United States, airlines are not required to pay you for weather delays or air traffic control delays, but they may owe you money for mechanical failures or their own operational mistakes. The Department of Transportation does not mandate compensation for domestic flights the way the European Union does, but some airlines have their own policies, and knowing the stated reason helps you figure out whether you have a claim.
If the airline won't give you a clear answer, ask for the delay code. Every flight has one in the system—it's usually a two-digit number that corresponds to the reason. Codes like "A0" mean mechanical, "B0" mean weather, and "C0" mean air traffic control. The gate agent may not volunteer this, but they can look it up if you ask directly.
Key Takeaways
- Call your airline's customer service line or ask at the gate to learn the official delay reason—they are required to have this information in their system.
- Delays caused by weather or air traffic control do not trigger compensation requirements under U.S. law, but mechanical failures or airline operational errors may.
- Request the delay code (a two-digit number) if the airline gives you a vague answer; this code corresponds to the specific reason in their system.
- Document the delay time, the stated reason, and any communication with the airline in case you later file a complaint or pursue compensation.
What the airline's delay categories actually mean
When an airline says "mechanical," they mean something on the plane itself needs repair—an engine, hydraulics, avionics, or another system. This is the airline's responsibility, and they cannot blame it on external factors. If a mechanical delay caused you to miss a connection or arrive more than three hours late on a domestic flight, some airlines will compensate you voluntarily, though they are not legally required to do so in the U.S.
"Weather" covers thunderstorms, snow, ice, fog, or wind that makes takeoff or landing unsafe. The airline is not liable for weather delays because they cannot control the weather. However, if the airline had the option to depart earlier or reroute and chose not to, that decision may fall under their operational control instead. This distinction is hard to prove, which is why weather delays almost never result in compensation.
"Air traffic control" means the FAA or another control center told the airline to hold the plane on the ground or in the air. This happens when airports are congested, runways are closed, or airspace is restricted. Like weather, this is outside the airline's control, and you are not owed compensation. The airline may offer a rebooking or voucher as a courtesy, but they have no legal obligation.
"Operational reasons" is the catch-all category. It includes crew scheduling problems, a late-arriving aircraft from a previous flight, passenger medical emergencies, security issues, or baggage problems. Some of these are the airline's fault, and some are not. If you believe the delay was caused by the airline's poor planning rather than a genuine emergency, you can file a complaint with the Department of Transportation, but proving negligence is difficult.
How to document the delay for a potential claim
Write down the flight number, scheduled departure time, actual departure time, and the reason the airline gave you. Take a photo of your boarding pass and any written communication from the airline. If you spoke to an agent, note their name, the time, and what they said. This record becomes important if you later decide to pursue compensation or file a complaint.
Keep your receipt for any expenses you incurred because of the delay—meals, hotel rooms, transportation, or rebooking fees. The airline is not required to reimburse these under U.S. law, but some airlines have policies that cover them, and having receipts makes it easier to ask. The European Union requires reimbursement of reasonable expenses for delays over three hours, but this applies only to flights departing from EU airports or arriving at EU airports on EU carriers.
If the airline offers a voucher or travel credit, read the terms carefully before accepting. Some vouchers expire after a year or have restrictions on when you can use them. If you believe you are owed cash compensation instead, do not accept the voucher without understanding what you are giving up.
Filing a complaint if you think the reason was inaccurate
The Department of Transportation's Aviation Consumer Protection Division accepts complaints about airline service, including disputes over delay reasons. You can file online at dot.gov/airconsumer or by mail. The DOT does not have the power to force an airline to pay you, but complaints are tracked, and patterns of complaints can trigger investigations.
When you file, include the flight number, date, the reason the airline stated, and why you believe that reason was incorrect. For example, if the airline said "weather" but you have a screenshot of clear skies at the airport, include that. If the airline said "mechanical" but the plane departed an hour later without repair, note that too. The DOT will forward your complaint to the airline, and the airline must respond within 30 days.
Be aware that the DOT complaint process is slow and does not result in direct payment to you. It is useful if you want a record on file or if you are considering small claims court, but it is not a fast way to get money back. For amounts under a few hundred dollars, small claims court in your home state may be faster, though you will need to prove the airline's liability.
When to ask for compensation beyond what the law requires
Some airlines have their own compensation policies that go beyond what U.S. law requires. United, American, Delta, and Southwest all have different standards. If your delay was caused by the airline's own error—not weather or air traffic control—call the airline's customer relations department and ask what they offer. Mention the delay code and the length of the delay. Many airlines will issue a travel credit or voucher if you ask, even when they are not legally obligated.
If the delay was very long (six hours or more) and caused you significant hardship, the airline may be more willing to negotiate. Have your documentation ready: the flight number, the delay code, your booking confirmation, and any expenses you incurred. Be specific about what you are asking for—a dollar amount, a travel credit, or a rebooking on a better flight.
If the airline refuses and you believe they are liable, you can pursue small claims court. You will need to prove that the delay was caused by the airline's negligence or breach of contract, not by weather or factors outside their control. This is easier to do if the airline's stated reason contradicts what you observed or if you have evidence that they could have prevented the delay.
Checking the flight's history after the fact
Websites like FlightAware and FlightRadar24 show historical flight data, including departure and arrival times. You can search your flight number and date to see when it actually took off and landed. This information is public and can help you verify the airline's stated delay time. However, these sites do not always show the reason for the delay—that information comes only from the airline.
If you want to dig deeper, you can request the airline's official delay report. Send a written request to the airline's customer service department asking for the delay code, the reason, and any documentation supporting that reason. Airlines are not required to provide this, but some will if you ask politely and explain that you are considering filing a complaint or claim. Include your booking confirmation number and flight details.
Frequently Asked Questions
Can I get my money back if the airline says the delay was weather?
No, not under U.S. law. Weather is considered an act of God, and airlines are not liable. However, if the airline had the option to depart earlier or reroute and chose not to, you could argue the delay was operational, not weather-related. This is hard to prove, and most airlines will not pay. You can file a complaint with the DOT if you believe the airline misclassified the reason.
What if the airline won't tell me the delay code?
Ask again, specifically for the two-digit code. If the agent still refuses, ask to speak to a supervisor or call customer relations. The code is in the airline's system, and they should be able to provide it. If they continue to refuse, note the date, time, and agent's name, and include this in a DOT complaint.
How long do I have to file a complaint or claim?
There is no federal important date for filing a DOT complaint, but it is best to file within a few months while details are fresh. For small claims court, the important date varies by state but is usually one to three years. Check your state's statute of limitations for breach of contract claims.
Does travel insurance cover flight delays?
Some travel insurance policies cover delays over a certain length (usually six to twelve hours), but most do not cover delays caused by weather or air traffic control. Read your policy carefully. If you purchased insurance, file a claim with the insurance company, not the airline.
Can I get compensation if I missed a connection because of the delay?
If both flights were on the same airline and booked together, the airline is responsible for rebooking you on the next available flight at no charge. If the flights were booked separately, the second airline is not responsible for the first airline's delay. You may have a claim against the first airline for the cost of rebooking on another carrier, but you will need to prove the delay was their fault, not weather or air traffic control.