$99 Flight Sale: Many US cities to Europe from only $99 one-way

Super cheap flights from many US cities to Europe from only $99 one-way.
Also works in reverse (from €124 one-way).
DEPART:
Pittsburgh/Boston/San Francisco/Chicago/Washington DC/Miami/New York/Detroit/St. Louis/Cleveland/Cincinnati/Los Angeles, USA
ARRIVE:
Brussels, Belgium
Reykjavik, Iceland
Copenhagen, Denmark
Dublin, Ireland
Milan, Italy
London, UK
Frankfurt/Berlin, Germany
Tel Aviv, Israel
DATES:
Availability from September 2017 to August 2018
https://wowair.us/