DALLAS -- Fitch Investors Service yesterday lowered its rating on revenue bonds for the new Denver International Airport to BBB-minus from BBB because of continual delays in the airport's opening and the escalating costs of the project.

The rating agency gave its lowest investment-grade rating to $3.2 billion of outstanding bonds as well as to $225 million of airport revenue bonds scheduled to be sold Aug. 30. The new bonds will carry project financing through next March and finance the building of a backup baggage system.

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