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Learn more Subscribe Sign In Follow the authors @Schlangenstein + Get alerts forMary Schlangenstein @AlanLevin1 + Get alerts forAlan Levin Southwest Airlines Co. temporarily halted flights nationwide as it grappled with "intermittent technology issues," just four months after an operations meltdown drew heavy scrutiny to the budget carrier. The airline said Tuesday that it was resuming normal operations after requesting a nationwide halt in flying from federal regulators earlier in the day. In an emailed statement, Southwest blamed a failure in a "vendor-supplied firewall" that interrupted the flow of data for flight operations. 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