Space shuttle Atlantis headed home Monday morning, riding piggyback atop a Boeing 747 for the trip from Edwards Air Force Base in Californina to the Kennedy Space Center at Cape Canaveral, Fla.
NASA had earlier postponed the journey due to bad weather. Thunderstorms and high winds prevented plans to begin flying Atlantis back home early Sunday.
The $1.8 million ferry flight began Monday at 11:07 a.m. EDT (1500 GMT), mid-morning local time in California.
[The shuttle has landed and will spend the night at Biggs Army Airfield in El Paso, Texas.]
Atlantis landed in California on May 24 after foul weather thwarted repeated attempts to return to its home port at the Kennedy Space Center in Cape Canaveral, Fla., following a successful mission to repair and upgrade the Hubble Space Telescope.
NASA is returning Atlantis to Florida atop one of its two modified Boeing 747 jumbo jets, which have been converted to allow a 100-ton shuttle to ride piggyback for the trip home.
The flight is extremely weather-dependent, since carrier craft cannot fly through rain, turbulence or extreme cold in order to avoid damaging the thousands of heat resistant tiles lining the shuttle's belly.
The ferry flights typically make stopovers at military airbases while awaiting favorable weather, and can fly as low as 10,000 feet (3,048 meters) to seek out good conditions.
"Flight managers are looking at various options for the best route to the Kennedy Space Center," NASA officials said in an update. "Weather remains very dynamic."
[A NASA spokeswoman told The Associated Press that the first stop would be at Biggs Army Airfield in El Paso, Texas.]
Atlantis is returning to Florida after a 13-day flight that marked the fifth and final service call on the 19-year-old Hubble Space Telescope.
Endeavour is slated to launch a crew of seven astronauts to the station on June 13 to deliver the last piece of outpost's massive Japanese Kibo lab. Five spacewalks are planned during the 16-day mission.
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