| https://pressbooks.pub/travelhistory/chapter/%f0%9d%9f%b7-%f0%9d%9f%be%f0%9d%9f%bc%f0%9d%9f%bc-%f0%9d%9f%be%f0%9d%9f%b8%f0%9d%9f%bf-%f0%9d%9f%b7%f0%9d%9f%b6%f0%9d%9f%b6%f0%9d%9f%bb-air-china-cancellation-policy-what-happens-if-you-need-to-canc-3/ |
| http://pressbooks.pub/travelhistory/chapter/1-866-829-1005-air-china-flight-cancellation-refunds-fees-and-terms-2/ |
| https://pressbooks.pub/travelhistory/chapter/cuanto-vale-un-cambio-de-nombre-en-iberia/ |
| https://pressbooks.pub/travelhistory/chapter/cuanto-tiempo-antes-se-puede-cambiar-el-nombre-de-un-vuelo/ |
| https://pressbooks.pub/travelhistory/chapter/cuanto-tiempo-antes-se-puede-cambiar-el-nombre-de-un-vuelo-2/ |
| https://pressbooks.pub/travelhistory/chapter/cuanto-tiempo-antes-se-puede-cambiar-el-nombre-de-un-vuelo-3/ |
| https://pressbooks.pub/travelhistory/chapter/cuanto-tiempo-antes-se-puede-cambiar-el-nombre-de-un-vuelo-4/
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