That doesn't neceearily address the issue when one person logged in and got the error, but tried from other public computers and still got the error. Unless they were using a public library computer which was on the list, and then tried another computer from a different library that was also on the list for instance. If you believe your ISP to be blacklisted, that's probably a place for you to start. Southwest may be identifying specific IP's, but thtey may also subscribe to lists of IP's to blacklist - one apporach to the issue would be for your ISP to take action not to be blacklisted.
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