Disagreements over redemption of those rights, which were granted to Frontier workers in 2011 in exchange for concessions, had delayed a deal for months prior to the announcement. Terms of the deal with Republic gave Indigo until the end of October to resolve those issues. Though the parties offered no comment on Tuesday, sources close to Frontier said that Indigo has a tentative deal in place with FAPA Invest, the fiduciary of the pilot equity interest, and expects to have the flight attendants on board to allow for a close. "A fair deal is in place," one source familiar with the pilot negotiations said. "Pilots are no longer an issue." All parties involved have been motivated to complete a deal. Republic and Frontier workers are eager to undo the company's 2009 purchase of Frontier out of bankruptcy protection, and Indigo hopes to continue to transform Frontier into a so-called ultra-low-cost carrier similar to one-time Indigo portfolio company Spirit Airlines ( SAVE ).