The word "airline" refers to a company that provides air transportation services for passengers or cargo. They operate scheduled flights to various destinations using airplanes. Full definition
We vigorously advocate for the American airline industry as a model of safety, customer service and environmental responsibility; and as the indispensable network that drives our nation's economy and global competitiveness. (airlines.org)
There are plenty of ways to earn miles with airline partners on the ground through shopping, dining, staying in hotels, renting cars and taking advantage of a variety of promotions. (rewardexpert.com)
Lately I've found it difficult to get much more than 1 cent per point of value out of airline miles for domestic air travel. (milenomics.com)