Explanation: Skytrax is a renowned consultancy firm that evaluates and ranks airports based on various criteria such as cleanliness, customer service, food and beverage options, and overall passenger experience. The rankings are based on surveys conducted among travelers, making them a significant indicator of an airport's quality and service standards.
In recent years, several Indian airports have been recognized for their improvements and high standards, with four making it into the top 100 globally. These airports are typically major hubs that handle a large volume of domestic and international traffic and have invested in modern facilities and services to enhance the passenger experience.
The four Indian airports that have been recognized by Skytrax in the world's 100 best airports are:
1. Delhi (Del) - Indira Gandhi International Airport
2. Hyderabad - Rajiv Gandhi International Airport
3. Bengaluru - Kempegowda International Airport
4. Mumbai - Chhatrapati Shivaji Maharaj International Airport
Kolkata (Netaji Subhas Chandra Bose International Airport) is not among these four. While Kolkata is a significant airport and has made improvements, it has not achieved the same level of recognition as the other four in the Skytrax rankings. This could be due to various factors such as the level of investment in facilities, the volume of international traffic, and the overall passenger experience.
Understanding the rankings and the criteria used by Skytrax can help in comprehending the standards and improvements required for airports to achieve high rankings. It also highlights the competitive nature of the aviation industry and the importance of continuous improvement in service and facilities to meet global standards.
In summary, the correct answer is Kolkata, as it is the only airport among the options that has not been recognized by Skytrax in the world's 100 best airports. This question tests the knowledge of the current rankings and the specific recognition of Indian airports by a globally respected consultancy firm.