Chicago's O'Hare International Airport opened a new runway and air traffic control tower Thursday, completing the latest piece of a nearly $9 billion overhaul of its outdated airfield. For more than a decade, Chicago has been untangling O'Hare's six crisscrossing runways and rearranging them in a safer, more efficient side-by-side layout that's supposed to unclog one of the nation's worst aviation bottlenecks. Yet delays still ensnare passengers traveling through the hub, and O'Hare is generally ranked dead last for on-time performance among the country's 29 biggest airports. Speakers at Thursday's commissioning avoided making specific promises on delay reductions, emphasizing instead...
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