Join Date: Sep 2005
Location: HEL
Programs: AY Platinum, TK Elite, BT Executive, AA, BA, SK, DL, NT, WB + hotels
Posts: 10,261
Under normal circumstances, 55 min will be completely fine. It's impossible to predict stand arrivals and departures, but the good thing is that if lines at passport control are long, you can use the automated gates with a US passport. If I were you, I wouldn't worry too much.