Marcia Dunn
AP
CAPE CANAVERAL, Fla. -- NASA is delaying its next space shuttle flight -- the last voyage of Endeavour with Rep. Gabrielle Giffords' astronaut husband in charge.

The flight was postponed because the original April 19 date conflicts with Russia's plans to send a cargo ship to the International Space Station.

Endeavour is now scheduled to blast off April 29 with Mark Kelly at the helm. It will be the next-to-last shuttle mission. Shuttle Atlantis will close out the 30-year shuttle program this summer.

NASA announced the postponement Monday, after conferring over the weekend with the Russian Space Agency and other space station partners.

An unmanned Russian cargo ship is set to blast off at the end of April. NASA did not want the craft docking at the space station while Endeavour was still there. Now, the cargo ship will arrive first.

The Journey of Endeavour