user: Question: What is the original air date when the u.s. viewers in millions was 5.39?
Columns: ['Series #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: [1.0, '" Pilot "', 'Anthony Russo & Joe Russo', 'Dan Harmon', 'September17,2009', 100.0, '7.89']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "U.S. viewers (million)" = '5.39';