A bit more about Leystad (LEY) and where it is in relation to AMS SIDs (in orange) and STARs (in yellow).
LEY sits more and less right below the main artery in to AMS from the northeast and east. The flight level of the passing planes above LEY will normally be at 7,000 feet or more.
Lelystad must be upgraded to become an overflow airport for AMS. Today's 1,200 m long runway have to be lengthened and I presume today's terminal isn't large enough.
https://maps.google.com/maps?ll=52.4...58.92,,0,-4.39