As Hurricane Harvey flood waters rose rapidly and feet of rain continued to fall around Houston on Sunday, hundreds of passengers sat stranded in the city's two international airports, where all flights had been grounded earlier in the day and all roads to and from the facilities were closed.

But Southwest and oft-beleaguered United Airlines scrambled to help fly nearly 900 passengers out of the increasingly underwater metropolis before nightfall.

The two airlines secured special permission from the Federal Aviation Administration and the Houston Airport System to conduct six flights out of Houston's Hobby and George Bush International airports to evacuate stranded passengers, according to the Houston Chronicle.

Crews rushed to get the planes in the air before dark because of the rising waters and the fact that runway lighting was not functioning.

Even before Harvey really began its wet rampage cross Texas, the house-sharing company had organized a way for people to offer up accommodations to those in need for free. Airbnb is also waiving all service fees for people affected by the storm and checking in before September 1.

The company's disaster response service was created following the aftermath of Superstorm Sandy in 2012.

The emergency in Texas is ongoing, so please also consider other ways that you or your company can help.