@ abaheti - If your flight isn't until November, I wouldn't necessarily panic just yet. Maybe they were shooting for a July 1 aircraft switch but need a few more days. Or, maybe it'll be October, no way to know. If it were me, I'd start looking at a Plan B, but would probably hold wait a while before dumping the flight you have. I'm by no means an expert on flights to South America, but great options are limited, and *IF* your/my flight is on a new 787, that looks like the best way to get to BOG to me. On my return I'm flying on COPA (due to the timing/availability of the flights). COPA adds one more stop (in PTY) which isn't great, and the long flight is in a 737MAX, and I prefer to avoid narrow-body planes on flights that long. On the plus side, the return is a daytime flight so getting a good block of sleep is less critical (southbound is overnight), and COPA's 737MAX actually has lay-flat seats in business class (something I've never seen before in a 737), so I decided to give that a try. In your case, it would add one more stop to your flight, so obviously not optimal.
I will be watching with interest to see if anyone reports on a new-smelling 787 actually being used on this flight now that it's July, or if there are any more press releases about that being delayed.