United Airlines reported it will replace Boeing 757s with "more efficient" 737s on transcontinental routes "between New York Newark and Los Angeles and San Francisco and between San Francisco and Boston", effective 04-May-2020, "due to the significant drop in premium demand" (Simple Flying, 22-Apr-2020).
United Airlines to operate 737s on certain transcontinental routes due to less premium demand
24 April, 2020