What do I need to check in at the airport if I have an electronic ticket?

In any case, an adult passport and a birth certificate for children are required to check in at the airport. The itinerary receipt is convenient because it contains all the flight data, it is recommended to have it at the airport, although this is not necessary for registration. At check-in at the airport, the passenger is given a boarding pass and baggage tags (when checking in baggage under the responsibility of the carrier). Duplicate boarding passes are not issued. It is necessary to keep the boarding passes received upon boarding the plane until the end of the trip.