LOUISVILLE, Ky. — Tiera Washington’s workload doubled during the holiday rush at UPS’ largest air hub, where seemingly endless streams of packages are sorted and shipped as the peak season puts the package delivery company to the test. The 23-year-old’s usual four-hour daily shift can stretch to seven or eight hours, and sometimes lasts 10 to 12 hours, as a small army feverishly plucks packages …
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