Just a day after making some high-profile cuts to its network, Alaska Airlines is out with a big expansion in San Diego.

Alaska Airlines plans to launch this year three new routes from San Diego and increase frequencies on some other routes to and from the city, the carrier announced Tuesday.

The majority of its planes were Boeing 717s, while Southwest has almost exclusively flown 737s since its inception. Taking ...

The Seattle-based carrier filed plans over the weekend to drop four high-profile routes over the next few months.

But, as TPG first reported last fall, Southwest customers won't have to wait until then to start seeing the more spacious ...