If temporary and permanent residents still need to check in at Immigration first, keep that in mind when you plan your timing. When I flew to the US for the first time in 19.5 years, the only INM agent at ZLO was checking in arriving passengers on a private plane out on the tarmac. This took so long that, if the arriving flight from Houston hadn't been so late, I (and Clayton) would have missed our outgoing flight back to Houston.