text: The airlines around the world are distinguished from each other by price, service, type of aircraft, and a number of other criteria?
classes:  No, for the same price, the services of the airlines are the same.  Besides, for the same price, the services of the airlines are the same.  Yes, for the same price, the services of the airlines are the same.  Meanwhile, for the same price, the services of the airlines are the same.