If you want to go to the source yourselves, it's at:
Doing business with the council - Luton BC
The relevant document is: PQQ Engineering, Project Management and Environmental Adviser. (Go to Pages 38 & 39.)
Next page includes this:
4. Timetable and Outputs
4.1 It is intended that an application for planning permission for the Red Line scheme will be submitted at the beginning of the second quarter of 2012; consequently, all documentation required for such submission, and all work required to support the submission, must be completed before that date.
4.2 So far as the Master Plan scheme is concerned, it is anticipated that work will continue on development of an outline scheme and other pre-application issues until the end of December 2012 but may continue until the end of December 2013. In particular, this will include work that is required by the Planning Act 2008 in respect of pre-application peer consultation. Transaction support (if required) may also continue until the end of December 2013.
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If you want to see a very large aerial photo of the airport with its red line then have a look just outside the airport chapel.