Jumpseating through Guam on CAL
 

I tried looking this up, haven't been able to get the right information. Has anybody had any experience with cabin jumpseating on CAL micronesia through Guam? If so, are the gate agents knowledgeable about the whole listing process and how long does it take. I am trying to get through GUM with only a 50 minute connection scheduled. It's a tight connection but it is the only option. Any information would be appreciated. Thanks.