British Airways to Southwest connection at LAS?
 

My other half will be arriving at LAS on a British Airways flight and departing on a Southwest flight 2:25 later. I could use some help laying out directions for her in order to make this easy. She will be in business class, will not have any checked luggage, and has Global Entry/Pre-Check, all of which should speed things up so I think that should be plenty of time.

I'm assuming after clearing immigration she will have to go back through security at T3? And from there she'll take the Red Tram to the D gates, then the Blue Tram to A/B gates? Then, depending on whether her WN flight leaves from the B or C gates, she would either walk to the B gates or take the Green Tram to the C gates? Do I have that right? If so, is that the right way to explain it to her (i.e., "look for the signs for the Red Tram to the D gates?")?

Thanks!

Yes, you've got it covered. If you'd like to get a better idea of the actual route, there are maps available online, e.g. https://www.mccarran.com/Maps