Last November the Swedish authorities signed a contract about US Immigration Preclearance that will be installed at ARN. (This makes possible the US Immigration control to take place at Arlanda and the flight will arrive as a domestic flight to the US airport). As far as I know, in Europe and in the Middle East such preclearance exists only at Shannon, Dublin - and Abu Dhabi (I wonder why...).

Any rumors about HEL joining that group? After all, with SFO starting on 1 June AY will regularly fly to four US airports. For pax it would be a great advantage - especially for those connecting to other US flights.