We are taking an Air Asia flight from Don Mueang airport on a Friday, and the flight departs at 10:30am. I know we need to be at the airport and checked-in by 9:30. We'll be taking a taxi to Don Mueang from Bangkok (near the Grand Palace). I hear a lot of horror stories about Bangkok traffic. What time should we leave our hotel if we wanted to get to DM by 9am? And should we just flag a taxi off the street or would it be better to call one and schedule a pickup time in advance?