Starting operations from Modlin also involved a lot of work in unseen corners - such as ATC. Warsaw-Modlin was
not on the map until recently (except as a light aircraft airfield) so new SID/STARs etc had to be designed and tested (plus instrument approach procedures). Traffic there increases the worlkoad at Warsaw APP to handle these arrivals and departures on top of the already fairly large traffic at Okecie. A bit similar to Paris-CDG APP handling Ryanair and Wizzair traffic in and out of Beauvais...
Cheers
