Code Review, to fetch auto populated data

Hello Have the javascript, which populated the Country, State, City and Airport Code based on the selection.
Code works, which is populated: Country, State, City as Dropdown and Airport Code display in Text Field.
Issue, Is how to pull the data from the text field for the Airport Code and stored in Django DB.

Here is the link to Javascript:

It doesn’t work if there is multiple cities in State. Like to get the String data.