Tanking is underway, filling the external fuel tank (ET - the big orange center tank) with a mixture of liquid oxygen and liquid hydrogen. The ET fuels the shuttle's three main engines during lift off. This particular ET was damaged during Hurricane Katrina. It was repaired and cycled back into the launch flow. The tank holds about 535,000 gallons of fuel.
| 11:30 p.m. | NASA TV: External Tank Fueling Coverage Begins |
| 11:36 p.m. | Countdown resumes at the T-6 hour mark |
| Midnight | Crew wakeup |
| 12:21 a.m. | Liquid Hydrogen Low Level Cutoff sensors go "wet" |
| 12:30 a.m. | Crew breakfast |
| 12:36 a.m. | Liquid Hydrogen "fast fill" begins |
| 1 a.m. | Crew final medical exams |
| 1:51 a.m. | LH2 "topping" begins |
| 2:36 a.m. | Countdown enters a 2 1/2 hour hold at the T-3 hour mark |
| 3:30 a.m. | Launch Coverage Begins on NASA TV and the Launch Blog |
| 4:31 a.m. | Astronauts receive a weather briefing from the Ascent Team |
| 4:41 a.m. | Astronauts suit up for launch |
| 5:06 a.m. | Countdown resumes at the T-3 hour mark |
| 5:11 a.m. | Crew departs for Launch Pad 39A |
| 5:41 p.m. | The astronauts begin to board Endeavour |
| 6:56 a.m. | Endeavour's hatch is closed and latched for launch |
| 7:46 a.m. | Countdown enters a 10-minute built-in hold at the T-20 minute mark |
| 7:56 a.m. | Countdown resumes at the T-20 minute mark |
| 8:07 a.m. | Countdown enters a ~40-minute built-in hold at the T-9 minute mark - MMT conducts final poll "Go-No Go" for launch |
| 8:52 a.m. | Countdown resumes at the T-9 minute mark |
| 8:56:26 a.m. | Launch of Endeavour on the STS-134 Mission |
| 9:04:49 a.m. | Main Engine Cut-Off (MECO) |
| ~ 10 a.m. | NASA TV: Post launch news conference |
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