> reporter: to first graders just learning the basics. > reporter: from fourth graders working on reading comprehension questions. > once we hit that last hour of the day it's strictly reading. > what do you think it is? > reporter: sean brown is the school's principal. and that included phillis wheatley elementary. Passed in 2012 that focused on the 100 lowest-performing schools. it is estimated to cost just over $5 million for the 20 traditional public schools required to add the hour in orange county, the 10th largest school district in the country. a ranking determined by the state's standardized reading test. this school year in florida, the 300 lowest-performing elementary schools are required to add an hour of reading instruction. > reporter: the extra hour of reading at wheatley elementary is not voluntary. > reporter: has he asked you why he stays an extra hour? > i don't even think he realizes it. you know, it's not like they're on the playground for an extra hour. > antonia, what did you think when you first heard that jaylon's school was going to require one extra hour of reading? > i was like, 'yes.' > reporter: yeah? > i was, like, 'yes.' i mean, what else would a child be doing that hour after school, you know? yes, it would be a longer day and i was concerned about him being focused and staying on task for such a long time. School in apopka, florida, just northwest of orlando in orange county. the disruption was caused by a fire at an air traffic control center- a fire apparently set by a disgruntled employee who later reportedly tried to kill himself. this was the scene depicted in the skies over the chicago area yesterday morning. more than 700 flights in and out of chicago were canceled today, still a significant improvement over yesterday when an estimated 2,000 flights to and from o'hare and midway were grounded. the order would not affect military and intelligence operations overseas, all this according to a report in the washington post. the white house is reportedly preparing an executive order that would require all federal agencies to disclose where they fly drones in this country and what they are doing with the data they gather. the increase is widely attributed to growing economic activity at the nation's factories. earlier this week, the president touted america's reduced carbon emissions but said the nation needed to do more. data released yesterday by the department of energy showed a 2.7% increase during the first six months of 2014 compared to back in this country, carbon emissions are on the rise. the 86-year-old was convicted and sentenced to life in 2012 on the same charges but the case was recently re-tried. in egypt today, hosni mubarak was taken by stretcher into a courtroom to hear whether he would be held responsible for the death of more than 800 protesters during the 2011 uprising that led to his ouster, but the verdict was delayed. thousands of others gathered near the scene and chanted in support of the demonstrators. the week-long protests followed a ruling that the central government in beijing would have to approve all candidates seeking to become hong kong's chief executive. in hong kong today, police arrested several dozen pro- democracy demonstrators who had scaled a fence and occupied a plaza outside a government building. we'll have much more on the conflict in a moment. British fighter jets flew missions over northern iraq.

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