If the airline has delayed your flight you will have two options. You can either opt for a 100 percent refund or take the next alternative flight sent by the airline. You would be provided with proper meals and beverages during the time of waiting.  If the flight is delayed by more than 5 hours, you can seek accommodation at the airport. The charges for the stay would be reimbursed by the airline. Get in touch with the ground staff of Brussels Airline in this situation.