t() :: %AdyenCheckoutEx.Model.AdditionalDataAirline{
  "airline.agency_invoice_number": String.t() | nil,
  "airline.agency_plan_name": String.t() | nil,
  "airline.airline_code": String.t() | nil,
  "airline.airline_designator_code": String.t() | nil,
  "airline.boarding_fee": String.t() | nil,
  "airline.computerized_reservation_system": String.t() | nil,
  "airline.customer_reference_number": String.t() | nil,
  "airline.document_type": String.t() | nil,
  "airline.flight_date": String.t() | nil,
  "airline.leg.carrier_code": String.t() | nil,
  "airline.leg.class_of_travel": String.t() | nil,
  "airline.leg.date_of_travel": String.t() | nil,
  "airline.leg.depart_airport": String.t() | nil,
  "airline.leg.depart_tax": String.t() | nil,
  "airline.leg.destination_code": String.t() | nil,
  "airline.leg.fare_base_code": String.t() | nil,
  "airline.leg.flight_number": String.t() | nil,
  "airline.leg.stop_over_code": String.t() | nil,
  "airline.passenger.date_of_birth": String.t() | nil,
  "airline.passenger.first_name": String.t() | nil,
  "airline.passenger.last_name": String.t() | nil,
  "airline.passenger.telephone_number": String.t() | nil,
  "airline.passenger.traveller_type": String.t() | nil,
  "airline.passenger_name": String.t(),
  "airline.ticket_issue_address": String.t() | nil,
  "airline.ticket_number": String.t() | nil,
  "airline.travel_agency_code": String.t() | nil,
  "airline.travel_agency_name": String.t() | nil
}