Departing American Airlines on 9/6, flight scheduled to depart at 5am. We plan to arrive at 3am no checked luggage but will probably print the tickets at the airport. Is this enough time to go through security and get to our gate? Do you know if we would need to change terminals in Miami for our continued flight onto Punta Cana? We have a 55 minute layover. Thank you, we don't travel very much. First time international travel in 35 years.