What can $1 billion buy these days? One of the top airports in the world.. In Short In terms of area, PIA is the fourth-largest airport in the country, and in terms of performance, it is often rated one of the world's best. A hub for USAirways, the airport is about a 25-minute drive from downtown, without traffic. PIA's Airmall was the first in the country, and continues to delight those on a stopover (more than 100 shops and restaurants help pass the time).