Hong Kong International Airport covers an area of 1,255 hectares (4.85 sq mi). The airport has a total of 90 boarding gates, with 77 jet bridge gates (1–21, 23–36, 40–50, 60–71, 201–219) and 12 virtual gates (228–230, 511–513, 520–525) which are used as assembly points for passengers, who are then ferried to the aircraft by apron buses.