As suspected, MaxJet is no more.
If you have paid for a flight with a credit card and you contact your credit card company within 60 days of seeing the charge on your bill, you are protected by Federal law. Just ask the credit card issuer to take the charge off your bill.
MaxJet is arranging alternate transportation with EOS Airlines (the best way to fly between New York and London anyway), but it's not clear if they are paying for the EOS flight. Seems unlikely. See details on their site.