You do not strictly need travel insurance to be covered for a cancellation, as airlines are legally responsible for rebooking you or providing a refund if they cancel your flight. In many regions, like the EU/UK (under EC 261/2004) or the US, you may also be entitled to compensation for meals and hotels if the cancellation is within the airline's control. However, travel insurance is highly recommended because it covers non-airline expenses that the carrier won't touch, such as non-refundable hotel bookings at your destination, pre-paid tours, or missed event tickets. Furthermore, insurance provides a safety net if you need to cancel due to personal reasons like illness or a family emergency—situations where the airline is not obligated to give you more than a future flight credit. Essentially, the airline covers the flight, but insurance covers the entire investment of your trip.