The 'delay letter': when to ask airlines for it and what it entitles you to
When a flight is delayed or, worse, canceled, all that can be done is to contain the damage, both in [...]

When a flight is delayed or, worse, canceled, all that can be done is to contain the damage, both 'logistically' and economically. Because delay or cancellation is often not only an inconvenience and stress for the victim, but they also involve additional costs and expenses. For example, for a meal at the airport, or for a night (complete with dinner and/or breakfast) in a hotel.
In this article:
Of course, beyond a certain amount of delay (three hours), the airline must compensate the passenger with an amount parameterized to the distance covered by the flight. Often, however, all it takes is an hour's postponement of departure to cause a connecting flight to be missed. In this case you can ask companies for a 'letter of delay' (delay letter, but which also applies in case of cancellation) stating beyond dispute that your flight has been delayed or cancelled, granting you the right to ask the airline staff at the airport of the missed connection for a free meal or a night in a hotel. In short, to 'cover' the expenses you will have to pay for the damage they caused.
American United Airlines, for example, delivers on request a certificate stating your flight number, date, and what happened to it flight (canceled, delayed, or diverted to a different airport than your destination).
Did you get your flight cancelled, miss your connection, land late?
You could get up to 600€ compensation per person
The photo coupon was issued by United's customer service at Chicago O'Hare Airport. Upon arrival in Los Angeles, with a connection blown and with a night necessarily to be spent in LA, the flight leader of the company did not bat an eye, booking a room in a hotel at the airport and handing over vouchers for dinner and breakfast.