Transportation

I'm concerned about transporting my macaw from the environment it has been living in (a high valley, moderate temperature of 23°C, low humidity) for over ten years, to his new home in the caribbean, seaside and very humid. People have told me I should beware the changes in salinity and humidity, that it might stress the bird and kill it, and that I should wait over a six month period and gradually transport it over the different environments. Could this be a real concern? Will my macaw suffer if I transport it in one day (a five hour drive from the valley into the coastside?)
Thank you! :)

Atte,
Suzy H.