I got kinda pissed off at COPA for not accepting a package I was trying to take with me LAX-PTY-GRU, they just refused to take it, nothing helped, offering to pay extra, whatever (I was on full Y) They also said F checked in full, and it was the only segment I hadn't been upgraded to initially.... fortunately they made that happen as I was boarding.

The manager offered to keep it in her office, and I ended up sending them a shipping label, and eventually got it shipped off... but goodness....
Fortunately, I was upgraded on all 4 segs, so that was good. And they treated me very wel onboard.

Unlike CO they serve alcohol in Y also. which is nice.

However, one more problem is that when I returned, my flights posted as Z and F, and so I didn't get the 6,000 or so EQM bonus I should have, it took a lot of calling up CO, CM, onepass... faxing stuff in, it was a mess because Onepass doesn't have access to Copa PNRs.

Eventually they fixed it, and I became plat (Retroactively for my next flight to Tel Aviv thank goodness!)