Wikipedia:Articles for deletion/STS-135
Admittedly this is tough. STS-135 does exist. It is not a flown mission, nor a planned mission; it is however a planning construct -- an alternative being given consideration. Because the Space Shuttle program operates so much in the public view, there are multiple sources which, taken cumulatively, adequately attest to the existence of STS-135 in that sense.  The article needs to make all that clear in its lede, and above all avoid  claims
— User:Sdsds, 05:21, 17 December 2009 (UTC)
Stance: keep
Cited policy: WP:CRYSTAL (Wikipedia:What Wikipedia is not)