Compensation often depends on three things: the length of the delay at arrival, the flight distance, and whether the cause was within the airline’s control. In the EU, fixed amounts apply (and can be reduced if rerouting shortens the delay outcome). In other countries, remedies usually include a full refund for unused tickets or rebooking at no extra cost. Airlines generally must refund within a stated timeframe; recent US and international guidance has been moving toward automatic refunds for significant delays. If the airline claims an “extraordinary circumstance” (severe weather, air traffic control strikes, certain security events), compensation may be denied but the airline may still owe care (food, hotel) depending on the regulator.