I'm looking to book 2 seats from either EWR or IAD to FRA/MUC (and connecting beyond). Will likely purchase Q class (refundable coach) seats. On the UA website, it permits me to book economy plus seats for an additional ~$109 each way. It also states that: "You may have the opportunity to purchase a premium cabin once you have booked your reservation". I'd like to know ahead of time approximately how much it will cost (miles/$) to upgrade these seats to business class seating on these TATL flights. Would anyone care to provide a best guess as to how many miles/costs in $ to upgrade these seats? It sure would be nice to know this prior to booking, United Airlines! Thank you!