The 747 and 737 can be found http://www.simviation.com/fs2002jets35.htm. ; It is the special Yananyi Dreaming schemes.  For both, you will probably have to mess with the .cfg file, so I will recomend you visit http://www.projectopensky.com and check out their 747-400 and 737-800 under the Oceania sections.  I am not sure if they will function to their full potential as they were both designed for FS2004, but it is worth a shot.  As for the 777 search for b772_qfa_jsw.zip over at http://www.avsim.com. ; I am sorry if this is not exactly what you are looking for.  Please let me know if I can be of any more assistance.

I highly recommend this aircraft to anyone who likes being a passenger it's got a whole cabin with tvs and stuff....but no real vc just a wall....meh who cares