* in-ter-ˈna-shə-nəl ˈer-pōrt
Breakdown:
* in-ter-: The "in" is short and the "ter" is pronounced like "tur"
* na-shə-: The "sh" is like the "sh" in "ship"
* nəl: The "l" is almost silent
* ˈer-: The emphasis is on the first syllable of "airport"
* pōrt: The "o" is like the "o" in "boat"
Let me know if you'd like to hear it spoken out loud. You can use online pronunciation tools like Google Translate or Forvo to listen to the pronunciation as well.