Thunderstorms caused American Airlines to cancel more than 100 flights in and out of its main hub, Dallas-Fort Worth International Airport, according to airline spokeswoman Andrea Huguely. Scheduling backups caused some of the cancellations in Dallas. "The system gets backed up when you have bad weather," Huguely said. "It creates a domino effect, it makes it difficult to catch up." It was unclear whether other airlines had also canceled flights to and from Dallas.
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