Southwest Airlines will end 16 daily routes on Jan. 6, a move the carrier said is a routine adjustment to its flight schedule based upon demand.

"The move allows us to offer itineraries with as little as one stop between these cities, while allowing us to better utilize our people and planes on routes that warrant new or additional service," a Southwest spokesman wrote in an email.

Among the daily routes to be discontinued are four that serve Los Angeles, three that serve Boston, three that serve Dallas Love Field and three that serve Orlando.

Southwest will also add routes in January. Notably, the carrier announced last week that it would launch eight Hawaii routes in mid-January, including the carrier's first service to Kauai and its first flights to Hilo on the island of Hawaii.

The grounding of the Boeing 737 Max has placed significant constraints on the airline's schedule. It had planned to be flying 75 Max planes by the end of the year. The carrier now expects to operate 11% less capacity during the fourth quarter than it had originally planned. Southwest has removed the Max from its schedule through July 5, 2020, but after that plans to bring them back into the fleet gradually.

The routes that Southwest will discontinue are:

Austin-San Francisco

Boston-Atlanta

Boston-Kansas City

Boston-Milwaukee

Columbus, Ohio-Oakland

Los Angeles-Omaha

Los Angeles-Pittsburgh

Los Angeles-Puerto Rico

Dallas-Jacksonville

Dallas-San Francisco

Dallas-Oklahoma City

Fort Lauderdale-Jacksonville

Orlando-Oakland

Orlando-San Jose

Orlando-Sacramento.