Commenting on the worst-ranking airlines, Which? Travel editor Rory Boland advised passengers to "fly with anyone else, if you can".
European countries, including EU member states, tend to dominate democracy indexes, even as democracy faces threats worldwide.
Some are even visiting to seek out potential places to relocate to, according to one travel expert.
Euronews takes a closer look at the favoured corporate tax centres across Europe and its overseas territories.
Hungary was the worst performing EU country in the NGO's annual Corruption Perceptions Index, while Denmark scored the best.