Atlantis is nearing retirement, with its last scheduled missions the contingent Launch on Need (LON) vehicle (STS-335) for Endeavour's final launch (STS-134), and STS-135, the last flight before the Shuttle program ends. This final flight was authorized by the President in October, 2010, to bring additional supplies to the International Space Station and take advantage of the processing performed for the Launch on Need mission, which will only be flown in the event that Endeavour's crew requires rescue. The 2011 federal budget, enacted on 15 April 2011, includes sufficient funds for NASA to fly the mission. As of 21 April 2011, NASA has yet to submit to Congress an operating plan, approval of which would cement funding, but this is considered a formality.
As of the completion of its 32nd flight (STS-132), Atlantis has orbited the Earth more than 4600 times, traveling over 120 million miles in space, or more than 500 times the distance from the Earth to the Moon. STS-135 will add an additional 5 million miles.