Houston airports still expect to stay open after Hurricane Harvey hits South Texas, but airlines are encouraging customers to change travel plans.

United, Southwest and American offered waivers for customers scheduled to fly to, from or through Houston and several other Texas cities from Friday through Sunday. Delta’s waiver of additional charges for changing plans runs through Saturday.

Airlines routinely cancel flights when bad weather is expected, although only a few have been scrapped so far, according to tracking service FlightAware.com.

Bill Begley, a spokesman for Bush Intercontinental and Hobby airports, says crews are clearing debris from drains and checking pump stations to prevent flooding.

Begley says the airports plan to stay open, but that could change based on what they hear from the airlines and federal aviation officials.

Meanwhile, Corpus Christi, Texas officials say all flights out of the city’s airport have been canceled as Hurricane Harvey approaches.

The city said in a news release late Friday morning that the airlines had canceled all flights out of Corpus Christi International Airport for the rest of the day.

The city said the airport isn’t closed, but officials don’t anticipate much activity over the weekend. Runways will be closed as conditions warrant. The hurricane is expected to make landfall late Friday or early Saturday morning.

The city says Southwest and United Airlines have no scheduled flights until Monday in Corpus Christi, while American Airlines hopes to resume service on Saturday.

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Photo Credit: Chris Mathew fills his vehicle and five gas cans at Costco in preparation for tropical weather on August 23, 2017, in Pearland, Texas. The U.S. National Hurricane Center said the tropical depression was expected to intensify over the warm waters of the Gulf of Mexico before reaching the Texas coast Friday. Steve Gonzales / Houston Chronicle via Associated Press