BALTIMORE – Coming in for a landing, my plane slammed down on the runway. By the time the person sitting next to me lifted the window shade, we were back in the air. Ten minutes later? Back on the ground. It’s not the ideal way to fly. When the flight attendant – playing to the heavy contingent of Cubs fans aboard – signed off with, “Let’s go Cubbies!” it struck that this was maybe not the ideal way to go through a baseball season, either. But the up-and-down Cubs are making a run at it, trying