Jo Rhodes, Deputy Editor of Which? Travel, said: "If your flight to or from Berlin is cancelled as a result of strike action by ground staff, your airline must offer you the option to be refunded or rerouted at the earliest opportunity, even if this means booking you a seat with a rival carrier. However, you are unlikely to be eligible for compensation as these events are considered an extraordinary circumstance, outside of the airline's control. "If you are significantly delayed, usually by two hours or more, your airline should provide assistance including free meals or refreshments, or overnight accommodation if required. If your flight is delayed by more than five hours, you have the same rights as if you had suffered a cancellation, and can request a refund or rebooking." -ENDS- Notes to editors: Which? consumer rights guide: 