
Spirit Airlines Inc (NYSE:SAVE) shares are trading lower Monday after the company rejected JetBlue Airways Corp's (NASDAQ:JBLU) proposal and said it will proceed with its previously-announced merger agreement with Frontier Group Holdings Inc (NASDAQ:ULCC).
Both Frontier and JetBlue aim to acquire Spirit to better compete with legacy carriers. Spirit has a merger agreement in place with Frontier for $2.9 billion.