You do know there are two more missions, right? I'm sure you do but I get the sense that a lot of people hear "final mission" and don't hear "for Discovery". The shuttles Endeavor will launch on April 19 and the shuttle Atlantis will launch on June 28. Atlantis will be the last shuttle to launch.
STS-134, Space Shuttle Endeavour Launch 3MAY2011/1648 PST
According to this Wiki entry it says:
http://en.wikipedia.org/wiki/STS-134
STS-134 (ISS assembly flight ULF6)[4] is the penultimate voyage of the Space
Shuttle. This flight will deliver the Alpha Magnetic Spectrometer and an ExPRESS
Logistics Carrier to the International Space Station.[5] The mission will also
mark the final flight of Space Shuttle Endeavour.[6] STS-134 was expected to be
the final space shuttle mission if STS-135 did not receive funding from
Congress; however, in February 2011, NASA stated that STS-135 would fly
“regardless” of the funding situation.[7]
http://www.collectspace.com/news/news-042610a.html
NASA shuffles shuttle schedule: Endeavour to fly after Discovery for final
planned flight
(excerpt)
April 26, 2010 — NASA has rearranged the flight order for its final planned
space shuttle missions, such that orbiter Endeavour will now have the
distinction of making the last flight rather than Discovery, as earlier
manifested.
The shuttles’ shuffle, which now has Discovery’s STS-133 mission launching to
the International Space Station (ISS) before Endeavour’s STS-134 flight, was
driven by a delay readying the latter mission’s scientific payload for launch.
As originally planned, Endeavour’s STS-134 crew was to deliver the seven-ton
Alpha Magnetic Spectrometer (AMS) cosmic ray experiment to the orbiting lab in
late July. The state-of-the-art particle physics detector, once mounted to the
station’s exterior, is designed to examine fundamental issues about matter as
well as the origin and structure of the universe.
http://www.nasaspaceflight.com/2011/02/nasa-insist-sts-135-will-fly-payload-options-assessment/
NASA managers insist STS-135 will fly – Payload options under assessment
February 13th, 2011 by Chris Bergin
(excerpt)
As the future of NASA’s budget finds itself under scrutiny again this week,
managers have told their workforce that STS-135 will fly “regardless” of what
happens with the funding situation via the Continuing Resolution (CR). Atlantis’
preparations for the final flight of the Space Shuttle are continuing without
issue, as managers debate the payloads which will ride to the International
Space Station (ISS).
And this latest update for Endeavour from Spaceflightnow.com
http://www.spaceflightnow.com/shuttle/sts133/status.html
1610 GMT (11:10 a.m. EST)
Meanwhile, tonight’s planned rollout of shuttle Endeavour from Vehicle Assembly
Building to pad 39A has been delayed by a forecast of poor weather and the
chance of hail.
The move is rescheduled for Thursday night starting at 8 p.m. EST.