The phrase "class flights" refers to different levels or categories of service provided on an airplane, such as first class, business class, or economy class.
This service is especially helpful for last minute business travelers who need to book cheap business class flights more often and at unexpected times. (indianeagle.com)
The post Why opt for first class flight tickets? (feedspot.com)
In fact, since then I can't even look at an economy class flight ticket the same way. (theprofessionalhobo.com)