ZK-JSN dyselxic Jetstream on FAA site.

Just finally managed to get into the FAA web site and:-

N135KM "is not assigned/reserved"

N153KM is listed as Jetstream 4101 c/n 41053 with a cert date of 12-01-2007 (that far back) to Northstar Aviation LLC of Boca Raton, Florida.