One distinction decides most of what an airline will do for you during a delay: whether the cause was within its control. Meals, hotels and rebooking on another airline almost always depend on it. Refunds and tarmac protections do not.
Controllable: the airline's responsibility
A delay is generally treated as controllable when the airline caused it. Common examples:
- Maintenance and mechanical problems
- Crew problems, such as a pilot or flight attendant not being available
- Cleaning, catering and fueling running late
- Baggage loading
- The airline's own computer or operational problems
Uncontrollable: outside the airline's control
- Weather at the departure or arrival airport, or along the route
- Air traffic control restrictions, such as ground stops and ground delay programs
- Security events and airport emergencies
The grey areas
Many delays have more than one cause, and how the airline classifies them is not always obvious.
- "Late arriving aircraft". This describes the effect, not the cause. If the aircraft is late because of a maintenance problem on its previous flight, the root cause is controllable. If it was held by a storm, it is not. Ask what delayed the earlier flight.
- Crew out of hours. Crews have legal duty time limits. If they run out of hours because of an earlier weather delay, airlines usually treat it as weather. If it is because of poor scheduling, it is controllable.
- "Weather" far from your airport. A storm elsewhere can legitimately strand the aircraft or crew you were waiting for. It can also be used as a catch-all. See is it really a weather delay?
- The cause changes. A delay can start as weather and turn into a crew or maintenance problem, or the other way round. The reason that counts is the one causing the delay now.
What depends on the classification
| What you may get | Controllable | Uncontrollable |
|---|---|---|
| Refund if delayed 3+ hours (6+ international) and you choose not to fly | Yes | Yes |
| Tarmac delay protections | Yes | Yes |
| Rebooking on the same airline at no charge | Yes | Usually |
| Meal voucher | Most large airlines commit to it, often after 3 hours | Rarely |
| Hotel for an overnight delay | Most large airlines commit to it | Rarely |
| Rebooking on another airline | Some airlines commit to it | Rarely |
The commitments in the right-hand columns vary by airline. Check yours: how to check your airline's delay policy.
How to find out which one you are in
- Read the notification. Airline app and text alerts often state a reason.
- Ask the gate agent, politely and specifically: "Is this maintenance, crew or weather?" Note the answer and the time.
- Check the FAA's airport status at nasstatus.faa.gov. A ground stop or ground delay program at your departure or arrival airport points to an uncontrollable cause. No restrictions, and other airlines leaving on time, point the other way.
The full method is in is it really a weather delay?
If you think the classification is wrong
Do not argue it at the gate. The agent rarely decides the code, and the conversation is better spent on rebooking. Instead:
- Ask for what you would be entitled to if the delay is controllable, and say why you think it is: what to say to the gate agent.
- Keep screenshots of the reason the airline gave, and of the FAA status at the time.
- Raise it afterwards in writing with the airline. If it refuses a commitment you believe applies, you can complain to the DOT. See US passenger rights.
This guide is general information for US travelers, not legal advice. Rules and airline commitments change; check with your airline or the US Department of Transportation for your specific situation.