Spirit Airlines is following the Allegiant Air model in offering vacation/travel packaging, adding to its already impressive array of ancillary revenue streams. By offering hotels and travel packages, Spirit is expected to further increase its ancillary business, which already accounts for 35% of total revenues, making it one of the leading ancillary revenue generators in the industry. Executive Vice President, Finance and Chief Marketing Officer Barry Biffle announced the addition of vacation/travel packaging to Spirit’s ancillary product offering during last week’s Dahlman Rose Transportation conference.