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

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'