(CNN) It's the first flight for many people who file onto these planes. But it's not a happy occasion.

Guards patrol the aisles. The passengers are handcuffed. And all of them have one-way tickets.

Planes chartered by ICE Air Operations, the division of Immigration and Customs Enforcement that coordinates the transportation and deportation of detained immigrants, fly more than 100,000 people back to their home countries every year.

And with President Trump vowing to increase deportations, it's possible that number will climb.

Who flies on ICE Air? Where do deportation flights go? And how much do they cost?

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