I own PMDG 600/700, 800/900 and queen of the sky. presently i have up to 900 installed on my pc. By installing queen of the sky will it inprove or add fetures to 600/700 and 800/900.Thanks

Nope.As far as I know these products dont share any features whatsoever.

I concur with Antti. The 800/900 update will add to the 737 NG series, however, there is no relationship to the 747 product line other than navdata/sidstars. One database for both- individual performance profiles. The 400F update for QotS will add to and improve all variants of the 400 as well as providing the new modeling for the freighter.Best-Carl F. Avari-Cooper BAW0225http://online.vatsimindicators.net/980091/523.png

Nameless,The 747 will not add any features to the NG, sorry.