I'd ask that you wait 2 more hours before booking flights. We should know by then if they're letting them stay on the plane in Miami while USCIS agents process paperwork (which is what we're hoping and praying can happen SOMEHOW) or if they are forcing them off the plane and into the shelter process.
Congratulations! One way or the other they'll be on American soil and well cared for tonight!!
I'll keep you posted.