This is a debated issues amongst the scholars of the past and between the modern day scholars as well. The question often asked is, does the travel begin with intention or when you leave the house?
Islamically airports take the rule of being outside the city, regardless of it's location. At the airport everyone knows you are a traveller. If you are at the airport you take the rules of a traveller and it is allowed for you to combine prayers.
Shaykh Waleed Basyouni answers and explains...
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