CREATE TABLE table_24798489_1 (original_airdate VARCHAR, challenge VARCHAR)

What is the original airdate of the episode where the challenge was three overstuffed sandwiches?
SELECT original_airdate FROM table_24798489_1 WHERE challenge = "Three overstuffed sandwiches"
SELECT "original_airdate" FROM "table_24798489_1" WHERE "Three overstuffed sandwiches" = "challenge"