Sleeping in Airports ' annual report highlights world 's best and worst airports . Frankfurt Hahn Airport , Germany . Airports judged on comfort , safety , security and customer service . Singapore named world 's best airport for 18th year in a row .
Sleeping in Airports ' annual report highlights world 's best and worst airports . Airports judged on comfort , safety , security and customer service . Singapore named world 's best airport for 18th year in a row .