kpc

Next year I'm attending a conference in Puerto Rico (SJU). After this, I would like to go to Havana, Cuba.

I see that Copa allows me to book flights on its website via Panama: SJU-PTY-HAV return on one ticket. I'm not a US citizen (Australian actually), and assuming SJU is an US port, is this OK / legal to purchase on the one ticket?

Also, I read that one can get a Cuban visa at the Copa checkin desk but would this be at SJU? or PTY? If PTY can this be done airside without the need to clear immigration at PTY?

Thanks in advance!