According to a statement by United Airlines, the company plans to stop flying to 11 small cities indefinitely.

The mortification of the schedule is due to the company’s aim for “long-term sustainability,” after COVID challenges United said.

“Many different factors determine a successful route and our decisions include careful evaluation of our overall network, fleet, resources at our regional partners, and yields. With that in mind, we have determined that these particular routes are not sustainable for the long-term,” the airline told Insider.

States that will be affected are as follows:

Kalamazoo/Battle Creek, Michigan

College Station, Texas

Columbia, Missouri

Mosinee, Wisconsin

Evansville, Indiana

Killeen-Fort Hood, Texas

Lansing, Michigan

Monroe, Louisiana

Pierre, South Dakota

Watertown, South Dakota

Twin Falls, Idaho

While United will no longer be flying to those places, other airlines such as American Airlines and Delta will continue to fly in or around those areas.