About every week I see a Cessna Citation/ Leerjet style airplane. It is always flying around 500-1000ft and following the highways through my town. They are the flat dark grey similar to the paint on a CH-53. A high horizontal stabilizer on the tail. 4 or 5 windows along the fuselage. Small upturned winglets. No other markings besides a black tail number. Do any of you aviation buffs know what plane this might be or who might be operating it? It looks similar to a leerjet 35 but without the wingtip fuel tanks. I'm trying not to be too tin foilish; it has just peaked my curiosity after seeing them for so long.