As retailers and manufacturers scramble to navigate around massive delays at ports and other problems in global logistics, enterprising companies have sought alternative avenues to reach the world's biggest consumer economy. Some have turned to Rickenbacker, a cargo-focused airport whose locale in Columbus, Ohio offers quick access to major highways, enabling truckers to reach nearly half the US population and one-third of that of Canada within a day. But after months of managing increased demand, officials at Rickenbacker International Airport realized this spring that they were too strained to accept all new business. IMAGES AND SOUNDBITES