You can get a Citation in to Denham its true, but, its not a great deal of fun and you cant do it public transport
If your using a C500 / C501 for public transport once you get less that 1200m you need to get your head in the books for figures and weights, more than that you are OK (or used to be) aat MAX AUW. You need more than 1200m for an ultra, or bravo.
That said 1200m is no problem at all in those aircraft.