# Use Cases
source: https://developer.mastercard.com/flight-delay-pass/documentation/use-cases/index.md

The Flight Delay Pass Service API allows issuers to provide airport lounge benefits to their cardholders in case of a flight delay. Cardholders register for this benefit days in advance of their flight and, should a delay occur on the day of travel, they will receive an email and text with a QR code to access the lounge through the provider. Merchant client id and proposition code must be configured in the mastercard system to execute the below use cases.

## Flight Delay Pass Service API Use Cases {#flight-delay-pass-service-api-use-cases}

|                                                                Use Case                                                                 |                                    |                            Description                            |
|-----------------------------------------------------------------------------------------------------------------------------------------|------------------------------------|-------------------------------------------------------------------|
| [Eligibility Check \& Registrations](https://developer.mastercard.com/flight-delay-pass/documentation/use-cases/registrations/index.md) | **Flight delay pass Registration** | Check for lounge availability and register for flight delay pass. |
| [Modify Registrations](https://developer.mastercard.com/flight-delay-pass/documentation/use-cases/update-registrations/index.md)        | **Modify Registrations**           | Update registration details by id.                                |
| [Get Registrations](https://developer.mastercard.com/flight-delay-pass/documentation/use-cases/retrieve-registrations/index.md)         | **Retrieve Registration**          | Retrieve registration details by id.                              |
| [Cancel Registrations](https://developer.mastercard.com/flight-delay-pass/documentation/use-cases/cancel-registrations/index.md)        | **Cancel Registration**            | Cancel registration by id.                                        |