Firstly, it's crucial to provide a detailed account of the incident. Specify the date, flight number, and departure/arrival locations. This helps Iberia Airlines pinpoint the exact situation you experienced. Emphasize the impact on your travel plans by outlining any connecting flights, hotel reservations, or scheduled activities you missed as a result of the delay or cancellation. Consider incorporating a timeline of events, providing context to your experience. This can include information on when you were notified of the delay, any communication from the airline, and how the situation was handled at the airport. The more granular you can get, the better. When addressing the impact on your overall travel experience, focus not only on the inconvenience but also on any additional costs incurred. For instance, did you have to arrange alternative transportation, book an extra night at a hotel, or spend on meals due to the extended delay? Attach receipts or documentation where possible to substantiate your claim. It's worth noting that airlines are often more responsive when passengers remain calm and polite in their complaints. Express your frustration but maintain a professional tone, avoiding unnecessary aggression. Remember, the goal is to convey the impact on your plans and encourage a positive resolution. As an additional resource, I found this website,
https://airadvisor.com/en/airline-complaints/iberia-airlines, to be helpful in understanding the complaint process and gathering insights from others who have faced similar situations. It provides a platform for sharing experiences and could potentially add weight to your case.