| X4 Booster Flight Log |
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| X4-01 – Eagle | |||||
| X4-02 – Columbia | |||||
| X4-03 – Zephyr | |||||
| X4-04 – (Ground Test Mockup) |
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| Date | Mission | Vehicle | Mission Notes | Engine | Location |
| August 14, 2010 |
PLS-01 | X4-01 | Maiden Voyage | D12-5 | Harmon |
| August 14, 2010 |
PLS-02 | X4-02 | Maiden Voyage | D12-5 | Harmon |
| August 14, 2010 |
PLS-03 | X4-02 | Flight Tests | D12-5 | Harmon |
| August 14, 2010 |
PLS-04 | X4-02 | Flight Tests | E9-6 | Harmon |
| August 14, 2010 |
PLS-05 | X4-02 | Flight Tests | D12-5 | Harmon |
| August 28, 2010 |
PLS-06 | X4-02 | Payload Section Tests | E9-6 | Harmon |
| August 28, 2010 |
PLS-07 | X4-02 | Payload Section Tests | E15-7 | Harmon |
| August 28, 2010 |
PLS-08 | X4-02 | Payload Section Tests | E9-6 | Harmon |
| August 28, 2010 |
PLS-09 | X4-02 | Payload Section Tests | E9-6 | Harmon |
| September 10, 2010 |
PLS-10 | X4-02 | Payload Test | D-12-5 | Harmon |
| PLS-11 | X4-03 | DDM test | E-15 | Harmon | |
| PLS-12 | X4-03 | DDM test | E9-6 | Harmon | |
| September 11, 2010 |
PLS-13 | X4-01 | D12-5 | Harmon | |
| PLS-14 | X4-01 | E9-6 | Harmon | ||
| October 9, 2010 |
PLS-15 | X4-01 | Camera | E9-6 | Harmon |
| PLS-16 | X4-01 | Camera | E9-6 | Harmon | |
| PLS-17 | X4-01 | Camea | E9-6 | Harmon | |
| PLS-18 | X4-02 | Camera | D-12-5 | Harmon | |
| PLS-19 | X4-02 | Camera | D-12-5 | Harmon | |
| October 23, 2010 |
PLS-20 | X4-02 | Payload / Alt1 | D12-5 | Harmon |
| PLS-21 | X4-02 | Camera / Alt1 | D12-5 | Harmon | |
| November 6, 2010 |
PLS-22 | X4-03 | SM Camera | E9-6 | Dayton |
| PLS-23 | X4-03 | SM Camera | E9-6 | Dayton | |
| PLS-24 | X4-02 | Camera | E18-7 | Dayton | |
| PLS-25 | X4-02 | Camera | E18-4 | Dayton | |
| November 7, 2010 |
PLS-26 | X4-01 | Camera | E18-7 | Dayton |
| PLS-27 | X4-01 | Camera | F24-7 | Dayton | |
| PLS-28 | X4-02 | Camera | F24-7 | Dayton | |
| December 11, 2010 |
PLS-29 | X4-01 | SM Camera | E9-6 | Harmon |
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