(AP photo/NASA)

This image provided by NASA taken Wednesday Nov. 26, 2008 shows the aft section of Endeavour's cargo bay backdropped against white clouds holding the multipurpose logistics module Leonardo, in this digital still photo, framed through a window on the International Space Station. Astronauts Donald Pettit and Shane Kimbrough, operating the space station's robot arm from inside the Destiny laboratory module, detached the Leonardo cargo canister from its temporary parking place on the station a few hours earlier and re-berthed it in the cargo bay for the trip back to earth. The shuttle is set to undock early Friday and return to Florida on Sunday.

Endeavour pulled away as the two spacecraft soared 220 miles above the Pacific, just east of Taiwan.

It was a poignant moment for all involved. Space station skipper Mike Fincke was missing his shuttle friends, even before Endeavour undocked.

"Thanks for the incredible makeover and leaving the station in fantastic shape," Fincke radioed. "And thanks to your heroic efforts, we are one step closer to a six-person crew."

Replied shuttle commander Christopher Ferguson: "Even from 25 feet, you look better."

With pilot Eric Boe at the controls, Endeavour slowly backed up 450 feet and began flying a full lap around the space station, essentially for picture-taking. The shuttle is due back on Earth on Sunday.

Thanks to Endeavour's delivery and the practically nonstop work of all 10 space travelers, the space station has almost everything it needs to accommodate a larger crew. NASA hopes to double the space station population — currently at three — by the middle of next year.

The space shuttle dropped off an extra bathroom, kitchen and bedrooms, and a new recycling system designed to turn astronauts' urine and sweat into drinking water. The processor needed some work before it finally started spewing out recycled urine.

Endeavour's astronauts also carried out an unprecedented clean and lube job on a jammed rotary joint during four spacewalks.

An initial test of the joint — which is needed to keep the solar wings on the right side of the space station pointed toward the sun — indicated that the repair work was successful.

The shuttle spent 11 days, 16 hours and 46 minutes at the space station, the second-longest visit ever.

American astronaut Gregory Chamitoff was headed home, finally, after six months in orbit. Taking his place at the space station was Sandra Magnus, who flew up on Endeavour for a 3½-month stay.

Before leaving, Chamitoff said he couldn't wait to see his wife and twins, who will turn 4 in January, and dig into some pizza and rocky road ice cream. He said it was hard