Source: Alaska Airlines

While complimentary amenities for economy passengers continue to fade away, Alaska Airlines is bringing one of its most popular free treats to two routes in the northernmost state: free beer. Starting March 3, when the airline's sister carrier, Horizon Air, begins flying 76-passenger Bombardier Q400 planes between Anchorage and Fairbanks and Anchorage and Kodiak, complimentary Alaskan-made microbrew will be offered. The beer—Old 55 Pale Ale—is made by Silver Gulch Brewing & Bottling in Fox, Alaska, 10 miles north of Fairbanks, and "will be as fresh as can be," said Lisa Luchau, Alaska Airlines' director of onboard food and beverage. (Read more: Pricey cocktails gaining traction at hotel bars)

"Silver Gulch will bring the beer down from Fairbanks to their facility at the Anchorage Airport and put it daily into environmentally friendly, stainless steel growlers called Kleen Kanteens, which our caterers will pick up and load onto the flights," she told CNBC.

While cups of Silver Gulch beer will be served only as part of the new Horizon Air service in Alaska, complimentary Northwest wines and microbrews are served on most all Horizon Air flights longer than 40 minutes. According to Luchau, Horizon Air, which flies to 39 cities in the United States, Canada and Mexico, updates the wines each quarter and the microbrews each month. (Read more: Travel trend: 'Get me somewhere warm now')

"The service is an important part of what we offer. And customers really enjoy it, as you can imagine," she said. Most Horizon flights are short, and Luchau said flight attendants are told to pour about 6½ ounces of the complimentary beverages into each 9 ounce glass. "Some flight attendants may be pouring more generously, but most passengers are just getting a sample," said Luchau.