My father (FO) and mother are in LA. Due to an issue with DL458 they were going to miss their connection and they lost their upgrade on 458 and are rebooked as "Y" on a later flight via Las Vegas. Long story short, on their itinerary it says Contact Delta for upgrade request on both flights and if I was to book them new tickets both flights are listed as "Upgrade Available." Rep in LA says they need to ask at the gate, is there anyway for me to do it online as I do not want Shena taking them off the upgrade list in LAX or LAS as rather than sleeping in their own bed tonight they are on a redeye