Modlin's problems are not entirely unexpected.
1/ Construction and commission of the new airport were rushed, with associated consequences
2/ Little regard was paid to local weather conditions, with the site being prone to fog due to proximity of the river Vistule (Wisla) - as any local inhabitant would tell you
3/ The short timeframe always looked tight regarding installation and calibration of a CAT I/II ILS
4/ Modlin's Warsaw Pact-style runway was made of concrete slabs. Simply laying asphalt/tarmac on top of these (while quick and relatively cheap) does not prevent subsidence. What about the original runway's PCN? I suspect Ryanair's 737-800s and Wizzair's A320s are heavier than anything that operated on the original runway before...
Methinks Wizzair will try to return to WAW, leaving WMI (if and when it eventually reopens) with only 1 Customer airline: Ryanair.
This debacle, along with the lack of CAT II (or III) approaches except on WAW's runways 11 and 33, does not paint a very serious image of Polish aviation infrastructure or forward thinking.
Cheers
