** Frontier Group Holdings <ULCC.O> Chief Executive Barry Biffle said the company's revised offer for Spirit Airlines Inc <SAVE.N> will be enough to secure a merger deal with the ultra-low-cost carrier. [nL1N2YE2IE]   (Compiled by Rajarshi Roy and Rithika Krishna in Bengaluru)  ((Rajarshi.Roy@thomsonreuters.com;))
Neutral
Neutral
Spirit Airlines Inc
Neutral
Neutral
Frontier Group Holdings