Suvarnabhumi Airport's position in the latest global rankings plunged this year, widening the gap between Thailand's gateway and benchmark airports like Singapore's Changi and Hong Kong International Airport.
Bangkok's main airport was 25th in a survey conducted by Skytrax, a UK-based aviation consultancy. It was 13th last year.
The results were based on 12 million passenger surveys; 388 airports were covered.
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