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The KC-135s were retired around 2004, and NASA went with a C-9B aircraft. However, recently NASA has been buying flights aboard Zero Gravity Corporation's Boeing 727. I've been in both the C-9 and the 727, and the NASA pilots in the C-9 were a lot smoother in the parabolas than Zero Gravity...

You could assume that the orbital energy of the planets remain constant: E = -G(M+m)/(2a) Where M is the mass of the sun that changes, m is the mass of the planet, and a is the semimajor axis. So: (M_1+m)/(2a_1)=(M_2+m)/(2a_2)

I don't remember what commercial planes I've been on, but non-commercially I've been on a C-9B and a 727 (Vomit Comet). In a couple of weeks I'll be going on a 737 to Las Vegas.

It currently works fine for me in Windows 7. One thing that others running Vista or 7 can do is move the program out of the Program Files folder to avoid UAC.

Not if you're dating an Aerospace Engineer... ;)

Here is a Java app that can be used to calculate porkchop plots: http://astrojava.com/btp/

It does if you're on the Vomit Comet. :)

http://www.heavens-above.com/IssHeight.aspx