Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| № | Title | Directed by | Written by | Original air date | Production code | U.S. viewers (million) |
| --- | --- | --- | --- | --- | --- | --- |
| 1.0 | " Pilot " | Alex Graves | J. J. Abrams & Alex Kurtzman & Roberto Orci | September9,2008 | 276038 | 9.13 |
| 3.0 | " The Ghost Network " | Frederick E. O. Toye | David H. Goodman & J. R. Orci | September23,2008 | 3T7652 | 9.42 |
| 4.0 | " The Arrival " | Paul Edwards | J. J. Abrams & Jeff Pinkner | September30,2008 | 3T7653 | 9.91 |
| 5.0 | " Power Hungry " | Christopher Misiano | Jason Cahill & Julia Cho | October14,2008 | 3T7654 | 9.16 |
| 6.0 | " The Cure " | Bill Eagles | Felicia D. Henderson & Brad Caleb Kane | October21,2008 | 3T7655 | 8.91 |
| 7.0 | " In Which We Meet Mr. Jones " | Brad Anderson | J. J. Abrams & Jeff Pinkner | November11,2008 | 3T7656 | 8.61 |
| 8.0 | " The Equation " | Gwyneth Horder-Payton | J. R. Orci & David H. Goodman | November18,2008 | 3T7657 | 9.18 |
| 9.0 | " The Dreamscape " | Frederick E. O. Toye | Zack Whedon & Julia Cho | November25,2008 | 3T7658 | 7.70 |
| 10.0 | " Safe " | Michael Zinberg | David H. Goodman & Jason Cahill | December2,2008 | 3T7659 | 8.54 |
| 12.0 | " The No-Brainer " | John Polson | David H. Goodman & Brad Caleb Kane | January27,2009 | 3T7661 | 11.62 |
| 13.0 | " The Transformation " | Brad Anderson | Zack Whedon & J. R. Orci | February3,2009 | 3T7662 | 12.78 |
| 15.0 | " Inner Child " | Frederick E. O. Toye | Brad Caleb Kane & Julia Cho | April7,2009 | 3T7664 | 9.88 |
| 16.0 | " Unleashed " | Brad Anderson | Zack Whedon & J. R. Orci | April14,2009 | 3T7665 | 10.15 |
| 17.0 | " Bad Dreams " | Akiva Goldsman | Akiva Goldsman | April21,2009 | 3T7666 | 9.89 |
Question:
What day did episode number 4 air originally?
Answer:
September30,2008