^^
(Edit: this is a repy to EddyBeers' post)
It's even worse than your scenario, though. Miami is in the Eastern Time Zone, and Chicago is Central, so at the start of the 8:30 church service in Chicago, it's already 9:30 in Miami. That leaves Obama only four hours to stay at the church long enough to hear the controversal sermon, travel by car to O'Hare, board his private jet, fly to Miami, depart his private jet, then travel by car to the site of his speech. No, there's no possible way he was in attendance the morning of that particular sermon.