What do green and red customs channels mean, and how much do the main customs sites weigh in revenue?

The green channel means no physical or documentary inspection; the red channel means physical and documentary inspection plus intervention by other competent agencies, which raises the average time at every customs post measured. According to SAT's Time Release Study, Puerto Quetzal (EPQ) accounts for 38% of foreign-trade revenue collection, Santo Tomás 15% and Express Aéreo 14% (annual averages); maritime clearance at the APM Terminals customs warehouse involves 86 activities and 10 public and private actors, at Santo Tomás 72 activities and 8 actors, and at Express Aéreo 65 and 8. Guatemala was the first Central American country and the second in Latin America to carry out a Time Release Study using World Customs Organization methodology.