Amsterdam has a very well planned out boarding 'room'. There are different lanes for passengers in boarding grounds A, B C and so on. The SB pax stand in one lane by themselves. On the STN - AMS there were around 6 SB pax but on the AMS - STN there were only two. I will be flying with Germanwings from STN in a couple of weeks, so it will be interesting to see how those flights go.