I have searched the forum and most post are older so seeking advice from Copa FF after reading the following to understand this properly and best method to execute:

I currently have 9:55A departure JFK to PTY and connection from there at 7:12PM

I would prefer to depart at 1:55AM JFK to PTY and spend my day in Panama.

I'm referencing this link https://www.copaair.com/sites/cc/en/...5-dolares.aspx = it is my take away I can call 24 hrs prior of my 9:55aM departure to change to the earlier segment (if same class of service)? My question is if they do not have my class of service available at T-24 - do I simply goto airport and wait standby (two hours prior)? And is Standby free of charge or also incurs the $25 if seat made available?

Bonus Question - Can any of it be accomplish via OLCI or airport kiosk a day in advance?? I haven't had the most reliable responses from Copa Customer Service in prior experiences.