There is no real answer to that. You can measure best on a number of levels, like facilities, accessibility, places that flight go to and come from. If you want to fly to a particular country, then you have to go through whatever airports it has and you are not as worried about the quality. There are a huge amount of airports in Europe and there are always ones that are upgrading their facilities and making other changes. Nobody has been in enough of the airports to be really able to compare them. So it is really a question that is impossible to answer.
The airport that United flies into when traveling to Europe is usually the Pisa Airport. This is a very large airport that is located in Rome. Often times, you will take a train from there to your destination.
Paris Charles de Gaulle Airport
There are hundreds of airport codes for European airports.
Giuseppe Verdi Airport in Europe has the code PMF. It stands for Milan Parma Airport located in Parma, Italy. The Parma Airport IATA code is PMF with world area code 450.
Sixt Rental Car, Avis, Auto-Europe, and Auto Locato are all car hires available from Bergamo Airport. Many reviews state that Auto-Europe offers the best rates and most available options.
London Heathrow is UK and Europe's busiest airport.
Yes, you can leave the airport during a layover in Europe, but it depends on the length of your layover and the visa requirements of the country you are in.
The smallest airport in Europe is located in Scotland. The Barra Airport has only 3 runways, the shortest one measuring 680 meters.
The best airport for traveling to Cappadocia is the Nevehir Kapadokya Airport (NAV).
greece
It is the International Vancouver airport. Also known as the 9th best airport in the world according from the records in 2012.
Munich. (a smaller airport serving other locations in Europe is Memmingen)