The built in search is pretty awful, I use Google with site:discussions.flightaware.com to search the forum.
The ‘P’ refers to the aircraft as being ‘pink-slipped’ by the FAA. This generally means that an update of the fractional registration is in process and therefore this aircraft is not eligible to fly outside of of the Continental US.
The P means they are not allowed to fly out of the u.s. Not raft equipped.