Have noticed that most people posting here seem to have large mileage balances that enable them to book award flights in F across long distances. I live in Ireland and fly UA to USA RT 2-3 times per year which only allows me to reach Silver status. No other option for earning here like credit cards-none linked to Mileage Plus etc. how do most of you accrue large balances:from miles flown or credit cards etc. or combo??