It’s something Kansas City Manager Brian Platt has been saying privately for more than a year, and now he’s acknowledging it on the record: He would push to close Charles B. Wheeler Downtown Airport if it continues to be hard for developers to construct high-rise apartment buildings in the airport’s flight paths over River Market and downtown. That would be an unpopular move among the top Kansas City businesses that use the airport — busier, actually, than Kansas City International Airport — or the celebrities and well-heeled Chiefs fans who find its close-in location convenient on game days. And it would be hard to pull off, something the ambitious young city manager said that he recognizes. “We haven’t run the numbers at a high level, but if it’s going to be a problem, if it’s going to be an ongoing, long concern and challenge for us with development in Kansas City, it’s something we’re going to explore,” he told The Star. Fans of the downtown airport, like its former longtime man...