First post, so sorry if this is in the wrong spot or a lame question, but I was wondering how checked baggage gets to the final destination if the flight segments are booked separately.

We are trying to get from the SFO-area to USH, but it seems like the best way to do this (in terms of using miles for the longest segment) might be to book SFO/SJC -> LAX and then use miles to get from LAX ->EZE, then one last segment from EZE->USH. And then something similar on the return. Are we going to have to get our luggage and re-check on each segment?

Posted this in the OW section, because most of my miles are on BA.

Thanks!