Drop-down list from external source

Hello
I have use caldera forms and now I need to resolve one problem:
I need to use drop-down menu or autocomplete text-line form with airports selection (over 9000 (!!!!!) positions) when I put this list to “Bulk options” site crashes or works extremely slow.
So can Caldera forms reads external data file with this list? and what the best recipe to use it?

Thank you

The page I need help with: [log in to see the link]