There are 4 companies tagged `frequent-flyer`; raised $4.5M from 4 investors
UsingMiles raised $3M from iSherpa Capital, Navin Dimond, and TechStars in 3 rounds.
Loyalty Travel Startup Raises $2.7 Million, Names eBags Founder As New CEO 
bizjournals.com
http://www.techcrunch.com/2008/09/23/techstars-demo-day-acquisitions-galore-as-twelve-companies-strut-their-stuff/ 
techcrunch.com
MilePoint raised $1M .
Superfly raised $500K .
ExpertFlyer raised $30K from Chris Lopinto .