Frontier Airlines is launching 20 new routes, a move that comes after Spirit Airlines' execs announced the business might not be operating in a year.

Frontier Airlines has gotten more aggressive for Spirit customers as its rival is on shakier financial footing.

Frontier Airlines announced Tuesday that it's adding nearly two dozen new routes with starting fares under $30, many of which will compete with the struggling Spirit Airlines.

Frontier Airlines is launching 20 new routes, a move that comes after Spirit Airlines' execs announced the business might not be operating in a year.