Question: What is the full amount of Total Cargo (in Metric Tonnes) where the Code (IATA/ICAO) is pvg/zspd, and the rank is less than 3?
SQL: SELECT SUM("Total Cargo (Metric Tonnes)") FROM "2-1451581-3" WHERE "Code (IATA/ICAO)" = 'pvg/zspd' AND "Rank" < 3.0;