The Chicago, Illinois, downtown skyline including the Willis Tower, formerly known as the Sears Tower, is seen from the air at sunset, February 15, 2013. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
The Chicago, Illinois, downtown skyline including the Willis Tower, formerly known as the Sears Tower, is seen from the air at sunset, February 15, 2013. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)