SAO PAULO (AP) – More than 25,000 passengers in Brazil saw flights delayed or cancelled after a damaged cargo jet blocked the lone runway at one of the country’s busiest airports for two days, officials said Monday.Separately, the check-in system at Tam airlines, Brazil’s biggest, was down for three hours early Monday at all locations around the world where the company operates, adding to the air transport chaos in Latin America’s biggest nation. Critics say improving the nation’s woeful airports is one of its biggest challenges before it hosts the 2014 World Cup. 5 greatest Kentucky Derby finishes Former Arizona Rep. Don Shooter shows health improvement Early signs of cataracts in your parents and how to help Mary Coyle ice cream to reopen in central Phoenix Construction begins on Chandler hospital expansion project Comments Share Sponsored Stories Patients with chronic pain give advice Top Stories Bottoms up! Enjoy a cold one for International Beer Day Improving airports plagued with bottlenecks, long lines and poor infrastructure was a key promise made by the government in its winning bid to host soccer’s premiere event in 2014. Hundreds of thousands of fans will fly between the 12 host cities for matches.Brazil’s airports have buckled under demand that tripled in the past decade. In 2002, airlines flew 34.3 million passengers on flights originating in Brazil. That rose to 107.8 million last year, Brazil’s civil aviation agency reported.In an effort to make quick improvements, Brazil’s government earlier this year privatized operations at three of the nation’s main airports, including at Campinas, awarding $14 billion in contracts to three consortiums that will expand and run terminals.However, the Campinas airport is still being operated by Infraero, the state-run agency that has long run the country’s airports. The other airports privatized include the nation’s busiest airport in Sao Paulo, along with those in the capital Brasilia and in Campinas.Together, the three airports are responsible for 30 percent of Brazil’s passenger traffic.(Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.) Azul Airlines, which operates about 85 percent of the flights at the Campinas airport north of Sao Paulo, said late Monday afternoon that its flights would resume normal operations by early evening after the damaged cargo jet was removed from the airport’s only runway. The jet, owned by U.S.-based Centurion Cargo, blew out a tire upon landing Saturday night _ it took Brazilian officials until Monday to locate the proper heavy equipment to remove the plane.The Campinas airport, also known as Viracopos, was Brazil’s ninth-busiest last year, according to government statistics, and was earlier this year named as one of three the government said it would privatize.“Although operations at Viracopos have been freed up, delays and cancellations may still occur,” Azul said in a statement.A spokeswoman for Tam airlines declined to say how many flights were delayed or cancelled because of the problems with its check-in system. The company operates about 800 flights a day around the globe. With the check-in system down, passengers’ tickets had to be processed by hand at airports. Brazilian TV showed long lines and crowded terminals at main airports in Sao Paulo and Rio de Janeiro.