As airlines over the years cut back in-flight service amid economic uncertainty, many travelers became resigned to the idea that they'll get a seat on the plane and nothing more.
Now carriers are looking for even more ways to boost revenue, and one tactic is the sale of bundled extra services.
Atlanta-based Delta Air Lines in 2012 quietly launched two bundle options -- a "Lift" package for $34 that offers priority boarding and an extra 1,000 frequent flier miles, and an "Ascend" package for $19 that includes priority boarding and a 24-hour Wi-Fi pass.
Delta executives have compared the move to the options when buying a new car or getting a car wash.
Executive Vice President Glen Hauenstein said the airline wants to allow customers to "control not just their transportation, but their experience" and is packaging extras to add value.
"We are just at our infancy of how many other products we can sell," he said.
Other airlines also sell bundles of extra services -- such as Southwest's Business Select fare and American's new Choice Essential and Choice Plus fares.
The options sold on Delta's website are available on flights out of 37 airports, and the company hopes to offer them more broadly across domestic flights over time. The Ascend package is only available if all legs of the flight are on planes equipped with Wi-Fi.