In the beginning, the Hustonians had compassion and opened the Astrodome to feed, clothe and house them.
The more ambitious of the group found jobs, relatives or whatever and cleared out within the first three weeks. It soon became apparent that there were a substantial number who would NEVER leave without more encouragement. Since IAH was the hub of Continential Airlines at the time, there were scores of flights which left daily with empty seats.
So the city struck up a deal with Continential and other airlines with similar empty seat problems. One-way tickets were made available to Astrodome refugees for a limited time. Within two short weeks or so, those remaining at the Astrodome was down to a couple hundred, which could easily be dispersed through the existing homeless shelter infrastructure.
Bump. And the Caravan is made up of 3rd worlders who are even worse than New Orleans spill over. There are however very good people in Honduras, some of these may be, but no filter is applied.