With parts of the United States finally thawed after another nasty winter, weary travelers can breathe a little easier. But cancellations are something airlines think about year-round. To better reaccommodate disrupted passengers, they are employing the next generation of internal automated rebooking systems and new processes for travel management companies.

Some airlines at first sought to rebook as many passengers as possible with software that beat manual processes used by airline personnel. Their newer systems use algorithms and lots of data inputs to find the most appropriate itineraries. American, Delta and United consider class of service, loyalty program status . . .

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