Subject: Formal Complaint — Lost Luggage and No Update for Five Days Dear [Airline Customer Service/Baggage Claims Department], I am writing to formally complain about the loss of my checked luggage and the lack of any meaningful update for five days. On [date of flight], I travelled on flight [flight number] from [departure airport] to [arrival airport]. I checked in one bag under baggage tag number [baggage tag number]. When I arrived at [arrival airport] on [arrival date], my bag did not appear at baggage claim. I reported the missing luggage immediately and received Property Irregularity Report/reference number [reference number]. As of [current date], five days have passed without any substantive update regarding the location or expected delivery of my luggage. I have contacted [customer service/baggage services] on [dates of contact], but I have not received clear information or a resolution. The missing bag contained essential personal belongings, including an outfit I intended to wear to a wedding on [wedding date]. Because the luggage was not returned in time, I missed the opportunity to wear the outfit and had to make alternative arrangements at short notice. This caused significant inconvenience, stress, and additional expense during an important event. I expect the airline to: 1. Provide a written update on the status and location of my luggage; 2. Return and deliver the luggage to [delivery address] without further delay; 3. Reimburse all reasonable expenses incurred because of the delay, upon submission of receipts; and 4. Confirm the claims process and applicable compensation if the bag is declared lost. Please provide a substantive written response and proposed resolution by [deadline date—e.g., seven calendar days from the date of this letter]. My supporting documents, including my boarding pass, baggage receipt, Property Irregularity Report, and relevant purchase receipts, are available upon request or attached. If I do not receive a satis