user: Question: What date did the episode that had 8.84 million u.s. viewers originally air?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [25.0, 1.0, '"Back to School"', 'Wendey Stanzler', 'DeAnn Heline & Eileen Heisler', 'September22,2010', '3X6501', '8.81']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "U.S. viewers (million)" = '8.84';