Sounds like adults are free to come and go.
From July:
https://sanantonioreport.org/behind-san-antonios-decision-to-open-a-migrant-resource-center/
Many of the migrants arrive in San Antonio with a ticket to another destination already, but about 25% still need a ticket or to be connected with the resources to get one. Once they arrive at the center, officials figure out the window of time they have to help each migrant or family get where they need to go.
“If your flight is leaving within so many hours we’re going to say the airport immediately, if not, wait here until your flight leaves, and within so many hours of your flight, we will take you to the airport,” Houston said. Migrants awaiting an asylum hearing in the U.S. are free to be in the country and come and go from the facility. The charter buses are paid for by nonprofit organizations or the migrants themselves, city officials said.
In this case, the buses are going to host homes in other cities. They are not being dumped. Apparently, adults are allowed to get on commercial flights. I always thought their flights were charter.
However, here is an article about the immigrants who went to Martha's Vineyard. Sounds like they were out and about.
27-year-old migrant recruited to fill flight to Martha’s Vineyard says he wanted to [b]help
https://sanantonioreport.org/migrant-recruited-fill-flight-san-antonio-marthas-vineyard/
Migrants near the McDonald’s parking lot across from the migrant resource center Thursday evening said they knew who Emmanuel was because he has been in the area for weeks picking up odd jobs. They said he had befriended some of the migrants who no longer had access to the center, but stuck around hoping to be hired for day labor.
Several said they heard Emmanuel tell other migrants that if they boarded the flight to Massachusetts, “No te faltara nada,” “You won’t need a thing.” They declined to give a reporter their names.
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Maybe what DeSantis did is not illegal??? Sketchy, shady, but not illegal
The DOJ can sue to halt these transports, but it's a gray area. It would be a civil procedure against Abbott or DeSantis. If DOJ sues, could it jeopardize legit transport of immigrants?