My 95-year-old parents are arriving SFO on United (guessing Terminal 3, Course E, Gate 60s-ish) and have a 52 minute layover before their Hawaiian Airlines flight (guessing from the International Terminal, Boarding Area A, Gates 1-12). They will probably be the last off their plane. They walk v-e-r-y slowly. I advised that they take the AirTrain, Red Line. 1) Sound correct? 2) Can they do it in 15 minutes, so there's time for a potty break? 3) Do they need to go through security again? Thank you! I appreciate any help or advice!!