user: Question: What was the original air date of the episode that was directed by Alex Zakrzewski?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [141.0, 1.0, '"The 34th Floor"', 'Duane Clark', 'John Dove & Pam Veasey', 'September24,2010', '10.35']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "Directed by" = 'Alex Zakrzewski';