Most restrictions on flights between the U.S. and Mexico will lift on Sunday, a change expected to bring more options and possibly lower prices for travelers.
American, Delta and Southwest have already announced that they will offer new flights across the border later this year. United is watching the demand for flights and will respond accordingly, a spokesman said.
The United States and Mexico agreed in December to open their aviation markets to each other's carriers. Rules that had generally limited two or three airlines from each country to a particular route will go away.
Airlines on both . . .