Input (grade 12): After Frankfurt and Munich, DÃ 1\/4 sseldorf International Airport is Germany's third largest commercial airport, with 18.6 million passengers annually.
Output (grade 9): DÃ 1\/4 sseldorf is one of the most important commercial centres in Germany. It has an International Airport, which is the 3rd largest in Germany (after Frankfurt and Munich) with more than 16,000,000 passengers per year.