CREATE TABLE table_30228 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( millions ) " TEXT)

How many millions of U.S. viewers watched the episode with the production code of 6AKY07?
SELECT "U.S. viewers (millions)" FROM table_30228 WHERE "Production code" = '6AKY07'
SELECT "U.S. viewers (millions)" FROM "table_30228" WHERE "Production code" = '6AKY07'