Well get the non-rev phone number for the carriers that are flying to your destination and try to list yourself. If you have AOA badges and company ID then it shouldnt be a problem. I used to fly for a 135 operator (not in cass) and I never had a problem jumpseating. Just make sure you call ahead of time, be curteous, dress to impress and always talk to the captain. If he say's no thank him anyway and move on to another carrier.