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A $310 million project to update and expand the popular “people mover” at Chicago’s O’Hare International Airport began in 2015, and the trains were supposed to largely remain running.

The project has not gone as planned.

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With air travel creeping up in recent months after a steep drop at the start of the COVID-19 pandemic, the Airport Transit System is still not running. The contractor has not provided an updated completion date, said Christine Carrino, a spokeswoman for the Aviation Department.

Here is a look back at how the project unfolded:

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