Originally Posted by
irishguy28
I was thinking it was far more likely to be a train service, but there is no real way of knowing. Those prices are far too high for a regular train ticket bought sufficiently in advance. The frequency of the service - almost 1 per hour it seems on most days - may mean it could be a train service - but there is no direct service from AMS/Schiphol to DUS so I am not at all sure what this relates to.
It doesn't appear in any way a KLM initiative, so I don't think that this is related to KLM moving shorthaul to trains.
(A full-flex economy train ticket on the same dates as I showed above for these "flights" can be had for less than half the price - but take more than an hour extra)
The ICE from Amsterdam Centraal to Dusseldorf HBF gets you no change from 2 hours. Then you need to add on the fiddly bits to each airport so unlikely to be a train. It would also be a huge increase in the number of services per day between the two cities (and ultimately the two airports), and I'm not sure they would get the paths for them. It's quite a busy line to Germany.
Given APG appear to be some sort of distribution agent could this be some back-end things not intended for public consumption that has found its way onto Skyscanner and will eventually flush itself out. Such things happen.