CREATE TABLE table_19022 ("Rank" FLOAT, "Airport" TEXT, "Total Passengers" FLOAT, "% Change 2005/2006" TEXT, "International Passengers" FLOAT, "Domestic Passengers" FLOAT, "Transit Passengers" FLOAT, "Aircraft Movements" FLOAT, "Freight  ( Metric Tonnes ) " FLOAT)

what is the maximum freight (metric tonnes) with airport being liverpool
SELECT MAX("Freight (Metric Tonnes)") FROM table_19022 WHERE "Airport" = 'Liverpool'
SELECT MAX("Freight (Metric Tonnes)") FROM "table_19022" WHERE "Airport" = 'Liverpool'