Flew out of DEN in mid February and the plane was never scheduled as a Max 9. To my surprise we walked in and it was a MAX 9 - it should be on this red eye anyway. We actually quite enjoyed it along with the great service we received. We ended up on another MAX 9 from PTY to SCL a week later. The 3 times I have flown COPA, I honestly do not really have anything bad to say about it..........so far.
I think I actually am going to book the exact DEN flight next year and then visit Lima.