Sochi International Airport and Moscow's Sheremetyevo Airport are among the five best in Europe, according to the ASQ (Airport Service Quality) research programme of the International Council of Airports (ACI).
Sochi Airport took the top spot, while Sheremetyevo was second. Third place was shared between Dublin, Malta, Porto (Portugal) and Zurich airports.
The ASQ is a worldwide programme which interviews passengers in airports on the day of their flight. Every year the project interacts with 600,000 people in 84 countries.
It studies travellers' opinions on 34 key indicators, including accessibility, check-in, security screening, bathrooms, shops and restaurants, and general ambience.
In July 2016, Sheremetyevo entered top ten most romantic airports in Europe. The rating was based on the airports, where users of French dating application Happn got the most matches.