> ## Documentation Index
> Fetch the complete documentation index at: https://yuno-3979e326-fix-create-subscription-card-usage.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Airline information

On this page, you will find airline information you may need when using Yuno API endpoints. It covers passenger types, fare class codes, and loyalty tiers. Use this page to understand and have access to standard values for each information category.

## Passenger type

| `passenger_type` | Description    |
| ---------------- | -------------- |
| `A`              | Adult          |
| `C`              | Child          |
| `I`              | Infant or Baby |

## Fare class code

The values can be a letter (A-Z) but may vary depending on the airline's definition. Type: String (MAX:1; MIN:1).

## Loyalty tier

| `loyalty_tier` | Description                 |
| -------------- | --------------------------- |
| `1`            | High classification level   |
| `2`            | Second classification level |
| `3`            | Third classification level  |