CREATE TABLE table_1317 ("Episode" FLOAT, "Title" CLOB, "Story" CLOB, "Adapted by" CLOB, "Director" CLOB, "Airdate" CLOB, "Exists?" CLOB)

What is the airdate when the director is george spenton-foster
SELECT "Airdate" FROM table_1317 WHERE "Director" = 'George Spenton-Foster'
SELECT "Airdate" FROM "table_1317" WHERE "Director" = 'George Spenton-Foster'