CREATE TABLE table_18727 ("#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( millions ) " TEXT)

When did the episode titled 'Winterland' air for the first time?
SELECT "Original air date" FROM table_18727 WHERE "Title" = 'Winterland'
SELECT "Original air date" FROM "table_18727" WHERE "Title" = 'Winterland'