Flew GRU-PTY on the 737-8 and PTY-LIM on 737-7 last week in J.
First leg I slept during the whole flight so cannot report any service. During the second one, service was at minimum (awful sandwich and water).
Both flights were packed, maybe due to end of year holidays.
PTY was very crowded. Please note that COPA lounge is closed and a cappuccino+whatever muffin is priced minimum 10USD.