Unfortunately it varies, and Copa continually changes their website interface to make it hard to find. First thing, with you based at BWI, I do not recommend a Connectmiles account, I recommend sticking with United as it will be more useful to you in the long run. That said, Copa economy classic books into a number of fare classes.

In my experience, I've booked economy classic directly from copaair.com and had it ticketed in Q, S, L, and T. Sometimes it's visible on the website before purchasing the ticket, sometimes not. It's not usually visible on the e-tickets they email.

So, rest assured it will credit UA RDM at 50%, 75%, or 100%.... but you will really have to dig to find it.

Here's where to find how fare classes credit: https://www.united.com/en/us/fly/mil...-airlines.html

If you buy directly from Copa, you will click 'Ticket number does not start with 016'

Enjoy!