It's good to see this forum area. I'm hoping it will be used to post tail/flight numbers of aircraft worth following. Other possibilities might be the codes for smaller airports that have special aircraft (possibly corporate craft) based there. Also please indicate what makes this tail/airport of special interest.
I'll begin it with an aircraft:
This is the charter plane of the Dallas Stars (NHL). Its flights roughly follow the road schedule of the hockey team, although there may some management travel added in. The plane is owned by Southwest Sports Aviation. SSA has a second plane used for road trips of the Texas Rangers (same ownership as the hockey team).
One interesting travel aspect I found is that when the team returns to Dallas, they don't go through Customs in Dallas. On the last trip back from Vancouver, they stopped at Great Falls, MT for about an hour. That must have been to clear Customs in an uncrowded location. The team values its privacy, I'm sure.
Photo of the plane is at: