CREATE TABLE table_16279 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

When did the 113 episode air?
SELECT "Original air date" FROM table_16279 WHERE "No. in series" = '113'
SELECT "Original air date" FROM "table_16279" WHERE "No. in series" = '113'