On what date did the episode 'Petra-Gate' air?
CREATE TABLE table_10622 (
    "Episode #" real,
    "Title" text,
    "Airdate" text,
    "Rating (Millions)" text,
    "Rank" text
)
SELECT "Airdate" FROM table_10622 WHERE "Title" = 'petra-gate'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: On what date did the episode 'Petra-Gate' air? ### Input: CREATE TABLE table_10622 (
    "Episode #" real,
    "Title" text,
    "Airdate" text,
    "Rating (Millions)" text,
    "Rank" text
) ### Response: SELECT "Airdate" FROM table_10622 WHERE "Title" = 'petra-gate'