Allegiant Air just announced 44 new nonstop routes, along with three brand-new cities. The airline is calling it the largest single expansion in its history. For now, all the new routes will be seasonal, but if demand is strong, they could become year-round offerings. All the new routes will be available two days a week.

The new destinations are important ones for the airline if it wants to compete with the likes of Delta and American Airlines. The new destinations are Boston, Chicago (Midway) and Houston. This is also a big move for the carrier, which normally offers flights to leisure destinations for those looking to escape the winter.

Most of the new routes are concentrated on the East Coast and Midwest, though Nashville will get nine new routes and flyers looking to travel out of Austin will enjoy four new routes. To see the full list of new routes and schedules, check out the airline's press release here. Meanwhile, Chicago's Midway will get six routes, Boston and Houston will both get four.

Allegiant is hoping to connect leisure travelers in cities that are underserved. In fact, the majority of the 44 new routs are non-competitive, meaning no other carrier offers direct service between the two airports.

Allegiant is a rapidly growing ultra low-cost carrier. By catering to leisure travelers, it can offer a bare-bones experience for those who just want to get their destination without a lot of frills. The airline is growing and added 15 Airbus jets just last year. It has plans to increase that number in 2020.

Adam Luehrs is a contributing writer at GET.com based in California. He likes traveling to new and exciting destinations, preferably on his credit card company's dime. When not on the road, Adam enjoys hiking around the mountains of San Diego, trying out new food and reading history books. Email: adam.luehrs@get.com.