BIRMINGHAM Airport has strengthened its working relationship with its opposite number in Chicago to increase hopes of a return to direct flights between the two cities.The Sister Airports agreement will see Birmingham and O’Hare International commit to the development of new opportunities; particularly the reinstatement of direct flights.Members of the executive management teams from Birmingham Airport and the Chicago Department of Aviation – operator of Chicago O’Hare International – met in Chicago last wee......for the full story register now for free or login below...