Maybe not flown, but could certainly have been bused, and how much exactly do you think it costs to provide benefits to homeless on a per capita basis? I'm not saying it's true. It's only what I've heard, and the economics of it work out, even if they were flown.
For what it's worth, the plane ticket seems suspect to me too, as you usually require an ID to fly, which most homeless are without.
I believe the solution to the homeless problem lies somewhere between a mental institution and a halfway house. A place where the homeless can receive ongoing care in a safe but controlled environment. But as a sacrifice, they lose freedom. These people need care and help, but some of them can also present a danger to society. That's the reality of it. I don't think people mind too much a person asking for a bit of help on the street, but when they accost you, they need to be managed.
Of course, if someone was willing to take them in and assume full responsibility for them, that'd be even better.