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By late Friday afternoon, more than 100 flights to and from Houston airports were also cancelled and conditions were expected to worsen over the weekend.
About one-third of all Saturday flights were already canceled at Hobby Airport, where Southwest is the dominant carrier. A Southwest spokeswoman said the airline expected to run a full Houston schedule on Sunday.
Airlines were offering customers the chance to reschedule trips that would take them to Houston, San Antonio or Austin from Friday through the weekend.
On Friday, American Airlines, Southwest and United scrubbed all flights out of Corpus Christi until Monday, according to an airport official.
Anyone with weekend travel plans that include a swath of Texas from San Antonio to Houston should check with the airline to see if the flight has been canceled..