Was on a couple rides on my employer's Citation. Very noisy inside. Couldn't stand and about same size as small minivan. But no lines, TSA etc. Arrive FBO and take off 5 min later. Cockpit view going 300+knots through clouds. But biggest surprise was the individual professionalism: once when i badly needed color photocopies and what i thought was friendly FBO attendent offering to help, then walk us to waiting jet, then sit in left seat, was our captain.