This is probably more relevant for Canadians on the Helpline, but there may be some passengers from the U.S. also booked (I believe they also flew out of JFK?).
Zoom Airlines has suddenly suspended all operations today, leaving passengers stranded on both sides of the Atlantic. Passengers at some airports were allowed to check luggage in preparation for flights, and a few hours later were told to pick their bags up at the carousel as they wouldn't be going anywhere. This situation is certainly reminiscent of the Canada 3000 situation a few years ago!
If anyone is interested in more details, have a look at This News Site.
The airline is trying to get creditor protection and new investors, so they may fly again? This is one reason I always book transatlantic flights through a travel agent, as in this area they're covered by a Travel Assurance Fund so getting a refund is not a problem (in the event the credit card firm won't cover it).
Hopefully, Zoom will fly again, as they provided excellent service to Europe!