United Airlines Holdings Inc. is making its largest ever plane order, adding Boeing and Airbus jets to fuel its post-pandemic growth plans.

The Chicago-based airline said Tuesday that it will purchase 200 of Boeing Co. ’s 737 MAX jets and 70 larger Airbus SE A321neos, a deal valued at more than $30 billion at list prices before customary discounts. United is looking to replace most of its 50-seat jets and other smaller, older aircraft with these larger planes that can carry more passengers and allow it to sell more premium seats.

The order—the largest by a U.S. airline since American Airlines Group Inc. ordered 460 new aircraft from Boeing and Airbus in 2011—is the latest sign of U.S. airlines’ growing confidence that travel is on course to snap back after being decimated by the coronavirus pandemic last year.

United lost more than $7 billion last year and accepted billions of dollars in government aid to continue paying workers. Now the airline expects to make money in July on an adjusted pretax basis, which would be its first profitable month since January 2020, the airline said in a separate filing Monday.