Online travel service TripAdvisor said it polled 4,000 of its users on a range of subjects from airlines and airports, to worries and holiday hotspots. Ryanair was not the only low-cost carrier singled out for criticism, with Easyjet voted the second worst. British Airways was picked as the best airline.

Ryanair countered that it consistently topped customer-service indicators. A spokeswoman said that Ryanair expected to carry 42 million people this year, "so we must be doing something right".

Despite its growing business and role in revolutionising the way Europe's air industry has operated, Ryanair has often also proved a controversial company.

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