(USAToday) - United Airlines passengers will no longer have to reach for their wallets if they ask for wine or beer on long-haul international flights. Not even in economy.

United says it will upgrade the food in its economy cabin, too, offering "a hearty three-course service" that will remain complimentary. Beyond that, the carrier will start selling the same light snacks that it already offers on its domestic flights.

The changes begin June 1, covering United's long-haul flights between the United States and Europe and Asia. They'll also include United flights between the U.S. and Argentina, Brazil and Chile.

"The changes to come on June 1 will deliver an elevated onboard experience on many of our intercontinental flights and will offer travelers the high level of service they expect from a global airline," says Sandra Pineau-Boddison, United's senior vice president of customers.

The return of free drinks and the upgraded meal service on the long international routes will likely be welcomed by United's economy customers. But the effort also comes as United faces stronger competitors, both in the U.S. and abroad.

American and Delta already offer complimentary wine and beer in the economy cabins of their comparable long-haul routes. So do many foreign carriers that fly to the USA, including Germany's Lufthansa, Japan's All Nippon Airways and Etihad Airways of the United Arab Emirates.

Henry Harteveldt, a travel industry analyst with Atmosphere Research Group in San Francisco, calls United's latest changes a needed first step in bringing United into line with other global carriers.

"Their alliance partners – as well as competitors – offer an open bar," Harteveldt says. "It's a small thing, but United doesn't want to lose a sale just because they're charging people for drinks in economy and other airlines are not."

"This is one of those moves that's logical for United to make in order to be viewed as competitive," Harteveldt adds, saying the airline has even more work to do if it wants to truly offer "an industry leading product."

United's economy-class drink and meal changes come amid a broader effort by the airline to up its game. For example, the carrier has revamped many of its hub terminals and has rolled out a new food menu at its frequent-flier clubs. United also has upgraded its meal service for first- and business-class passengers on flights within North America.