We contacted you a few days before your flight to inform you that we needed to move your departure time back by 1 hour because we likely needed to refuel before. This was an estimation and we offered you the front seat next to the pilot (usually a premium) as a gesture to make up for the inconvenience. We also offered you alternative times to accommodate you or a refund as last resort. We had a very busy schedule for the day of your flight and refueling can in fact take up to 30-40 minutes, so the change was made as a precaution to avoid a delay.