Wednesday is the earliest Houston's airports will reopen

Hurricane Harvey impacts Gulfport flights

Nine airport, including Houston's two main airports - George Bush Intercontinental Airport and Hobby Airport - remain closed Monday as the region continues to grapple with devastating flooding throughout the area. According to a flight tracker, all three flights landed safely. So far almost 400 flights have been preemptively grounded for Monday.

Southwest Airlines was granted special approval by the FAA to fly 486 people on five separate flights from Houston to Dallas.

Airport crews will be monitoring the airfield throughout the storm.

An 11:39 a.m. arrival, as well as a 9 p.m. arrival, on United Airlines to the Gulfport-Biloxi International Airport have been canceled.

Hobby is the smaller of two main Houston-area commercial airports.

United cancelled about 90% of their schedule by midday Sunday, with the decision to cancel all flights coming at midday. IB/OB roads are closed due to flooding.

There were about 500 Southwest passengers stuck inside the airport after the Federal Aviation Administration shut it down on Sunday morning, CNN reports.

Travel writer Joe Brancatelli said Monday, "The Hobby situation is worse, obviously, since they have runways under water". Southwest offers 152 daily departures from Houston Hobby.

Hurricane Harvey made landfall in southeast Texas over the weekend causing widespread destruction and disruption, along with disrupting thousands of flights across the country.

The statement said: 'Our Hearts are with South Texas, our Southwest Family, and everyone affected by the storm. Fliers should also consider airlines' flexible rebooking policies to move their flights to dates after the storm.