CREATE TABLE table_39486 ("Name" TEXT, "Pennant number" TEXT, "Ordered" FLOAT, "Builder" TEXT, "Commissioned" TEXT)

On what date was the ship with a Pennant number of Q144 commissioned?
SELECT "Commissioned" FROM table_39486 WHERE "Pennant number" = 'q144'
SELECT "Commissioned" FROM "table_39486" WHERE "Pennant number" = 'q144'