This is one thing many visitors to Europe don't know, but travellers traveling in/out with the EU, In particular having an EU airline, have lots of legal rights owing to anything known as the EU Regulation 261/2004. Flights to Europe with adaptable booking procedures are available by using the research https://how-to-find-cheap-flights80245.wikigop.com/1351298/how_to_find_cheap_flights_to_europe_from_the_us_fundamentals_explained