from dataclasses import dataclass
from typing import Optional


@dataclass
class Airline:
    """Airlines are used to identify the air travel companies selling and operating
    flights
    """

    id: str
    name: str
    iata_code: Optional[str]

    @classmethod
    def from_json(cls, json: dict):
        """Construct a class instance from a JSON response."""
        return cls(
            id=json["id"],
            name=json["name"],
            iata_code=json.get("iata_code"),
        )

from dataclasses import dataclass
from typing import Optional


@dataclass
class Airline:
    """Airlines are used to identify the air travel companies selling and operating
    flights
    """

    id: str
    name: str
    iata_code: Optional[str]

    @classmethod
    def from_json(cls, json: dict):
        """Construct a class instance from a JSON response."""
        return cls(
            id=json["id"],
            name=json["name"],
            iata_code=json.get("iata_code"),
        )

Airlines are used to identify the air travel companies selling and operating     flights Construct a class instance from a JSON response.