toJson method
Implementation
core.Map<core.String, core.dynamic> toJson() => {
if (confirmationCode != null) 'confirmationCode': confirmationCode!,
if (eticketNumber != null) 'eticketNumber': eticketNumber!,
if (frequentFlyerInfo != null) 'frequentFlyerInfo': frequentFlyerInfo!,
if (kind != null) 'kind': kind!,
};