# `IataAirline`

An airline's two-character code: `BA`, `U2`.

Use it to name an airline. With a flight's number, use [`FlightNumber`](/docs/types/type-flight-number.md).

## Shape

One value, held as text in one set form, with no parts: `6E`.

## Example

```jadpo
IataAirline("BA")
```

`IataAirline(raw)` checks the text, and text that isn't one breaks the `format` rule.

`text.parse(raw, as: IataAirline)` reads one from text that comes from outside. Text that isn't one at all fails `malformed`, such as `ba`, `99` or `B`.

## Good to know

- `==` tells you whether two are the same. `<` and `list.sort_by` don't take it.

## In JSON

A string, in a request, a response or `json.write`:

```json
"BA"
"U2"
"6E"
```

## Details

<details>
<summary>Text form, storage, how it is shown, and operations</summary>

`IataAirline` is in the group Travel, and has been in Jadpo since 0.1.0.

### Text form

`text.from` writes one standard text form, the same form `text.parse` reads back: `BA`, `U2` and `6E`.

### How it is stored

It is stored in one column named for the field, of type `text`. `U2` is stored as `'U2'`.

### How it is shown to people

`text.format(value, locale:)` shows it to people in their locale.

With `locale: Locale.en_gb`:

| Value | Shown |
|---|---|
| `BA` | `BA` |
| `U2` | `U2` |
| `6E` | `6E` |

### Operations

It also takes `text.parse`, `text.from`, `text.format`, `json.read`, `json.write` and `==`. [How every standard type behaves](/docs/every-standard-type-meets-one-contract.md) says how they work.

</details>