United has announced it will reach 750 flights per day this summer from Chicago O’Hare International Airport (ORD), 200 more than its next largest competitor and the largest schedule ever flown by any airline operating there.

The announcement was made as competition with American Airlines has escalated. American is scheduled to fly 34% more departures from O’Hare in March than it did a year earlier, according to Cirium flight-schedule data. When American announced its expansion plans in late December, the airline’s chief strategy officer, Steve Johnson, said, “We’re committed to rebuilding our Chicago hub to be stronger and more compelling for our customers.”

United will offer nonstop service to 222 destinations this year — more than any other airline at ORD, and 38 more than its next largest competitor — including 47 international cities across Europe, Asia and South America as well as 175 US destinations, according to the announcement.

Starting in April, the airline is strengthening connectivity across the Midwest with five new routes from ORD to Midwest cities, including: Champaign/Urbana, Illinois, and Kalamazoo, Michigan (both four times daily beginning April 30); and Lansing, Michigan, La Crosse, Wisconsin, and Bloomington/Normal, Illinois (all four times daily beginning May 7).

In addition to enhancing connections between ORD and small and midsized communities, more than 80 cities will receive additional flights to give customers more options from Chicago. They include Boston, Nashville, Los Angeles, San Francisco and Dallas. United’s Chicago hub is expected to become the third largest hub operated by any airline in the US, according to the announcement.

Omar Idris, United’s vice president of ORD, said, “This growth at O’Hare highlights our commitment to invest in our network, customers and hiring in the city we call home.”