In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
Islamically, airports take the rule of being outside the city, regardless of their location. At the airport everyone knows you are a traveler. If you are at the airport, you take the rules of a traveler and it is allowed for you to join prayers.
Sheikh Waleed Basyouni answers your question in this short video:
Almighty Allah knows best.
Source: FaithIQ Channel