The EU regulation 261/2004 states that there are circumstances in which an airline does not have to compensate their delayed or cancelled passengers. These circumstances are called ‘extraordinary circumstances’ this is when the cause of the delay is outside of the control of the airline. Bad weather, terrorism, natural disasters and security issues are examples of an extraordinary circumstance. Other circumstances that are seen as extraordinary are lightning or bird strikes. A Flight Observation Pack is a report which provides the necessary information to prove if a delayed or cancelled flight falls under the scope of the 261/2004 regulation. In addition weather reports, airport performance and press articles are included to indicate if an extraordinary circumstance could have been the cause of the delay or cancellation.