HAVANA — Galo Beltran stands on the tarmac testing a hand-held baggage scanner. Each time a barcode is successfully read, he smiles. The device, which is used to track luggage, is deployed at airports across the world. But until this moment, Beltran wasn't sure if it would work on Cuban cellular networks. As satisfying as meeting that challenge was, there are hundreds more to be tackled as U.S. airlines prepare to resume their first regularly scheduled flights to Cuba in five decades. Collecting baggage fees in a country where most U.S. credit cards don't work, for instance. And solutions need to be found rapidly — airlines must start flights within three months of being granted a route by...
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