Airlines hope to meet the traveler demand for premium flying, whether by offering more roomier seats in economy or upgrading higher-tier classes. Airlines and Airplanes, Frequent Flier Programs, Customer Relations, Luggage and Packing, Airports, Travel and Vacations, Customer Loyalty Programs, Alaska Airlines, American Airlines, British Airways PLC, Delta Air Lines Inc, Emirates Airlines, Frontier Airlines Inc, JetBlue Airways Corporation, United Airlines, Southwest Airlines Company Airlines hope to meet the traveler demand for premium flying, whether by offering more roomier seats in economy or upgrading higher-tier classes. NYT > Business