Are there aircraft observation decks in Beijing Capital Airport Terminals 2 and 3?

If no, is Cordis BJ Capital Airport Hotel one of the favourable hotels for aircraft-spotting?

I am looking for opportunity to shoot a few pictures of Air Koryo aircraft without checking in to any flight at Terminal 2.

If not possible and have to check-in to a flight in order to shoot pictures of Air Koryo aircraft, which non-Air Koryo flight should i consider boarding in order to be nearer to Air Koryo aircraft?