I went to JC yesterday morning from 8:50 - 11:35. Around 9 a.m., Athena flew in from the northwest, and landed on a 39th floor parapet on the NW corner of 101 Hudson. After waiting a few minutes to see if additional flight action would happen, I started walking east along Columbus Ave, intending to go out to the waterfront for the wide-angle view. I stopped at Hudson St., and chose instead to walk south along Hudson St. and check the ledges on the low buildings that line the east side of the road (the falcons have made use of those the last 2 years).
I reached the corner of York & Hudson (the southeast corner of 101 Hudson itself) around 9:10 a.m., and got a brief look at a falcon making quick circles over one of the low buildings. When it re-appeared, I saw that it was Six. Shortly afterward, I heard Boss calling out, and he soon appeared gliding over the buildings!

Over the next few minutes, Six and Boss soared directly overhead, with Boss vocal the whole time (although he appeared to be carrying a small prey item; perhaps Six or Athena had delivered it to him just prior to my arrival). Boss quickly gained altitude, aided by the southwesterly winds (ushering in our next heat wave) creating updrafts along the buildings. He ended up somewhere on the north side of 101 Hudson, but out of view from the street. Both adults had snuck away as well.
Between 9:45 - 10 a.m., Boss made a few loops around the top of 101 Hudson. Afterward, he apparently found a shady spot on one of the terraces on the west side of the building. I headed out to the Grundy Park pier for awhile, and had an unconfirmed sighting of Boss at 10:48 a.m., this time flying south over Hudson St. and disappearing over the low buildings again. A search of the area turned up empty ledges, so he might've found a shady spot on a roof.
Activity shut down after this, and with the exit of clouds and the temperature quickly heading for 90, I left at 11:35 a.m.
Here's Six circling over the low buildings:



Here's Boss showing his flight/soaring skills! He started out quite low off the low buildings. Camera settings were a little too dark; some editing brought out some underside detail (it's not real easy to see, but he is carrying a small prey item in his right foot).





Additional photos of Boss at higher altitudes (with some extras taken after the falcon activity quieted down):
http://www.flickr.com/photos/80696806@N06/sets/72157634655964758/detail/