Originally Posted by
WineCountryUA
As a Plat, you can guest companions into E+ even went on separate PNRs. You will need to call to do this (watch from time to time if there are schedule / aircraft changes that might sweep the individuals back to E-.
You can also guest the individual into your boarding group and premier (not Pre-Check) security line.
More in the thread's wiki
Thanks! That is helpful. Do I have to call to book or is it call after the fact to get a new seat assignment?