Officials of Denver International Airport say the airport’s contractor redeveloping its main terminal may be breaching its agreement.

In a letter Friday, DIA officials said Denver Great Hall LLC needs to make changes to address concerns.

The airport officials’ main issues are fire-damaged escalators caused by demolition, cleaning delays and concerns about minority hires.

The project — which involves moving the airport’s security check-in points from the main terminal’s Great Hall to a higher level near DIA’s airline check-in stations — is years behind schedule.

“We continue to work through a number of issues on the Great Hall Project but areas which we will not compromise on are safety and quality. We have a responsibility to protect our passengers and employees and when any of our contractors take actions that we believe are unsafe, we address them immediately,” DIA said in a statement to 9News.

The developers said in a statement that the assertions in the letter are not fair.

“We are disappointed by — and completely disagree with — the mischaracterizations and false allegations made in these letters,” said Alana Watkins, spokeswoman for the company.

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