Here’s a tip, ring the Concierge line and you will get free seat assignments on tickets. I did it this week on 17 tickets I booked in the sale. Secondly, if you are asked to pay excess baggage at Check-In on some extra kilos, instead of paying it at the check-in desk, ask can you pay it at the ticket desk. Once I’ve shown my Conc card there the fees were waived. This worked in Dublin as well as Frankfurt where the ticket desk staff was an agent. Check-in staff have very little discretion but the staff on the ticket desk have. It goes without saying, be polite at all times. Finally, while the 4 upgrade vouchers are great, there has been a number of occasions were all fare difference charges have been waived on ticket changes by the Aer Club staff on the phone. The money this has saved me over the last 12 months has paid for my on board cuppa many times over👍🏼.