Low-fare airlines Spirit and Frontier announce a multi-billion-dollar merger; the controversy over the Miami Dolphins may have an impact on the race for Chicago's casino; and three multi-million-dollar homes are now off the market for those searching for local luxury homes.

Crain’s Chicago Business Editor Ann Dwyer joins us to go behind the headlines.

Crain’s Headlines is a joint production between WTTW and Crain’s Chicago Business. It airs every Monday on the WTTW News program “Chicago Tonight.”