CHICAGO (AP) -- Chicago officials admitted late last week that the expansion of O'Hare International Airport is at least 400 (m) million dollars over budget.
They also said that the project is running behind schedule because of unforeseen delays and opponents to the expansion.
The 15 billion dollar project will add eight new runways and was originally set to be finished in 2013.
Officials said the federal government approved the project 14 months later than the city expected.
The increased costs have been due to expensive legal battles with O'Hare opponents and higher than anticipated land-acquisition costs.
The news on the delays and higher costs was delivered Friday as officials gear up for an O'Hare bond sale in November to pay for construction.